I own a Mossberg Model A "Spotshot" 20X target spotting scope which I bought back in 1953. It is in excellent condition except for the fact that all of the internal tubes and lenses were removed for cleaning some years ago and I lost the order in which they have to be re-assembled. The optical train consists of the following: 1. optical "stop" with 1/2 " hole, thickness 1 mm 2. aluminum tube spacer, length 41 mm 3. " " " " " length 19 mm 4. " " " " " length 18 mm 5. " " " " " length 5 mm 6. Lens, dia 12 mm, focal length 22 mm 7. Lens, dia 9 mm, focal length 16 mm 8. Lens, dia 3 mm, focal length 22 mm 9. compression coil spring 10. objective and eyepiece ( No question about where they go.) I measured the focal lengths using the sun as the source, and a mm scale. They are approximate. I thought I could use the above information to figure out the order of assembly, but so far without success. I'm down to trial and error, which is driving me nuts. I sure hope you can help. Thanks in advance for your help.

Question edited for clarity and toss in some CAPS and spaces.
Question moved from 'Made Computers'.

There were several variants in terms of available barrel length (4", 5 1/2", and 7"), target grips, and frame colors (gray or black). The stainless steel version (as opposed to the blued steel) was called the 22S.

Dating

https://www.smithandwessonforums.com/threads/curious-about-s-w-model-22a-manufacture-date.18754/

More on Dates, it is an earlier one

https://www.google.com/search?q=smith+and+wesson+22a+serial+number+lookup

Gun Values board is a good place for pricing, but remember, Condition is everything.

S&W Model 22A

Gun Values Board https://www.gunvaluesboard.com > sw-model-22a-43...
Smith & Wesson serial number prefixes · Learning About Your Smith & Wesson Revolver (Updated) · Where Can One Go to Look Up Serial Numbers, For Smith & Wesson ..

More on Values

https://www.google.com/search?q=smith+and+wesson+22a+value

..

Look at red-dot optics. You don't really need magnification with a shotgun and you will want something you can get on target quickly.

The Iver Johnson Cadet was offered as (the basic gun) as the Model 55 Target, and the 55A then the 55S Cadet and the 55S-A Cadet. The "parent" is discribed as: IVER JOHNSON MODEL 55 TARGET,Revolver,double-action,22LR,8-shot,4 1/2",6" bbls and 10 3/4"(6") 9 1/4"(4 1/2") over all length weight 24 oz.(4 1/2") 26os(6"); large frame,pull pin cylinder release with flash control front rim; recessed cylinder chambers;fixed sights,oversized molded one piece Tenite plastic target type grips; Does not have the "hammer the Hammer'action,matte blue finish; After 1958 cylinder is fluted hard chrome lined barrel introduced in 1955; dropped from production in 1979..the .38 caliber offering is designated as the Model 55S-A which is the same as the above except that: it was offered in .22LR,.32 S&W and .38 S&W(this is NOT a .38S&W Special) and as an 8-shot in .22, as a 5-shot in both .32 and .38. it is 7 1/2" oal w/ loading gate on the Right side AFter 1974/1975 this model is called"I J Cadet it was introduced in 1961 and dropped in 1979 Values: Vgood=$110..Good=$85 and Fair=$75. This data is from the Gun Digest Book of Modern Gun Values and more detailed Iver Johnson histroy can be had from www.gunshowbooks.com..check out Bill Goforth's Iver Johnson Arms&Cycle Works Firearms 1871-1993..Bill also frequents these forums and he along with Jim Hauff will likely correct any misinformation I may heve relayed as well as correct any ommisions.

Numrich Arms - now known as Gun Parts Corp is your best bet.

Scopes with fully multi-coated internal glass-to-air surfaces (lenses) are recommended as they allow the highest level of light transmission through the binoculars (90 - 95% of the light that enters the binoculars will reach the eye) with limited internal light scattering and reflectivity. This results in fully multi-coated binoculars, spotting scopes and rifle scopes producing brighter, sharper and higher contrast images than coated or multi-coated binoculars. Unfortunately, fully multi-coated optics are more expensive to manufacture and are often only incorporated into higher-end binoculars, so your choice may depend on budget.

Bushnell Trophy Xtreme Spotting Scope

Bushnell Spotting Scope has extra power for extra range; its BaK-4 Porro-prism design delivers magnificent clarity in a traditional design. The multicoated optics ensure maximum light transmission for the brightest and take the images more colorful and clear. If you are searching Bushnell Scope that can be used for different activities, you should consider Bushnell Trophy Xtreme Spotting Scope Review.
The highly refractive BAK4 Porro prisms diminish spherical deviations for increased edge-to-edge sharpness and help progress depth of view. This combination of optics and coatings creates a spotting scope that produces clear, bright, highly contrasted images with the exact color transmission.
The rubber-armor structure stands up to demanding use. This scope is 100% waterproof and fog proof for wet hunting conditions. It also Comprises compact tripod with window mount, compact soft case, and waterproof hard case.

James

Decoding H&R serial numbers is not easy and it takes up quite a bit of the H&R book as different models usually have seperate serial number series. gererally speaking there were three types of serial number series.
Pre 1905 (1904 and before) which were more like batch numbers and usually ran from 1 to 99,999. on some models there was a different series every year.
Post 1904 (1905 to 1939) one single series starting at 1 and going into the middle 6 digits (some third model auto-ejecting revolvers have been observed with number in the 800,000 range.
Ift here does not look like there are any markings on the left side of the barrel other than the caliber this would be the premier model fitted with extra cost oversize grips and 6 inch barrel. during the same time (1925-1934)frame H&R offered this revolver as the H&R TARGET (aka model 766) the only difference was H&R Target was marked on the barrel. by the time the premier model was fitted with a longer barrel and oversize grips the cost was about the same for the two models. the offering of the H&R Target model was just another way to try to sell more revolver. factory serial numbers are not available for this model so i believe this revolver was manufactured before the H&R Target was introduced in 1924 (most likely 1920 to 1923)
below is information of both models.

H&R PREMER SECOND MODEL SMALL FRAME TOP BREAK R.F. & C.F. ----------1905-1941
Small fame double action top break revolver with double top post barrel latch; calibers and cylinder capacity, 22 rimfire-7 rounds, 32 S&W, 5 rounds; automatic cylinder stop; standard finish Nickel with case harden hammer and barrel latch; standard barrel length 3 inches, with 2, 4, 5 and 6 inches available as optional; HAS CALIBER MARKINGS ON LEFT SIDE OF BARREL WAS MANUFACTURED FOR SMOKELESS POWDER CARTRIDGE PRESSURES.
There has not been enough data gathered on serial number to try to come up with a serial number range for the different variations.
First Variation, model name & caliber marked on left side of barrel, patent dates 5-14-89, 4-2-95, 4-7-96---------------1905-Only
Second Variation, model name & caliber marked on left side of barrel, patent dates 4-2-95, 4-7-96-------------------1906-1908
Third Variation, caliber only marked on left side of barrel, patent date 10-8-95-------1909-1913
Fourth Variation, caliber only marked on left side of barrel, no patent date, state not spelled out in address (MASS)---------1914-1915
Fifth Variation, caliber only marked on left side of barrel same as 4th except different font used in barrel markings----------1914-1915
Sixth Variation, caliber only marked on left side of barrel. State name in barrel marking spelled out (MASSACHUSETTS)-----1916-1924
Seventh Variation, new grip frame, there is no step down for the grip panels to fit into-----1925-1942
After 1930 listed in catalogs as; PREMIER No. 30 .22 Rimfire 7 shot & PREMIER No. 35.32 S&W 5 shot
VALUE: 100%=$265 60%=$75 Add 10% premium for blue finish; 20% premium 4", 5" or 6" barrel; 20% premium for 22 rimfire caliber; 10% premium for 7th variation
If this is a top break it is a H&R Premier model manufactured in the 1924 to 1930 era or one of its variations. if it is a solid frame model it is a model 1906 or one of its variations manufactured in the 1932 to 1937 era. without a picture or knowning the exact markings i can't give you an exact model.
1940 and after letter codes used to denote year of manufacture. starting with A in 1940 and going to BC in 1986.
Caliber markings on the side of the barrel ALWAYS indicate 1905 or after manufacture. when H&R made the switch to smokeless powder in 1905 they started marking the caliber on the left side of the barrel of all their handguns. no caliber markings = black powder, caliber markings = smokeless powder.
Please keep in mind that H&R did not always obey their own rules and there are exception to every rule. during 1890 though 1904 H&R was manufacturing so many top break revolvers they starting using a letter code after 100,000 had been reached. these letter code were stamped along with the serial number on the bottom of the top strap (the cylinder had to be removed to see this location).
Hammerless Bicycle models (1899-1920). the caliber markings and 6 digit serial number indicate it is a second model and if in good condition it should be safe with modern ammo. the bicycle hammerless (small frame, 2 inch barrel) is serial numbered in the same series as the regular small frame hammerless model.

Pete

Strip it and clean the slots the two stops ride in. If that doesn't fix it, replace the stops. Mossberg will replace them free of charge. If you're a Handy Andy, once you get the new stops from Mossberg, examine the old ones and file and stone them so they match the new, working ones. You'll see what was wrong.

If you're getting a good dent, it's the ammo, not the gun. The good dent is all you hired the firing pin and spring to do. They did their job....don't blame them for the screwed up part time workers.

http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=2ahUKEwir8pyq_PXfAhVB4IMKHckRDY4QFjAAegQIChAC&url=http%3A%2F%2Fwww.mossberg.com%2Fwp-content%2Fuploads%2F2017%2F05%2F12173-Owners-Manual-Pumps-English_REVABweb.pdf&usg=AOvVaw0EL7tRtP4AlaKV61dqThZm