Smith & Wesson did not make the Double-Nine. High Standard did, and it was available with two cylinders. One was a .22LR cylinder the other was chambered in .22 Magnum. sales@countrygunsmith.net
Caliber should be on the barrel. SN's were not required until 1968
If it came from the factory with both cylinders, you shoot the ammo the cylinder was designed for.
mfg date of your smith should be between 1860-1868
Generally speaking, no, and, you should never try to fire any ammo from a gun other than what it is designed to fire. You may be able to get it to fire, but you could damage the gun or hurt yourself.
It should be.
Depends on the revolver. Just flipped through one of my references, and it lists 13 different .32 revolver cartridges- not counting the obsolete .32 rimfires. While the most common is probably the .32 S&W, you are not holding your revolver close enough to the computer for me to identify the caliber. Have a gunsmith take a look at it- most of those 13 I mentioned do NOT interchange.
use 32-20 ammo The caliber of the ammo is 32-20. It is not common although it is still available.
I just paid $89 for one at a dealer. It has a six inch barrel, 8 shot, in fair condition, with scratches in bluing. But hey, it should work for a plinker!
1. You will have to call S&W for a correct answer 2. Plus P means higher than normal pressure ammunition. "Other than 38 plus P" could mean another caliber, or normal pressure ammunition. The caliber should always match the revolver you are shooting. Normal pressure ammunition of the proper caliber can always be used in a firearm, unless the firearm is a machine gun which requires higher pressure ammunition to operate consistently.
No way we can answer your question without having examined the revolver. Gerstenberger and Eberwein produced an inexpensive line of small caliber handguns and blank guns. Importation to the US stopped with the 1968 Gun Control Act. These are not noted as being extremely high quality firearms. Yours should be examined by a competent gunsmith before firing.
It appears that this is a Colt New Model Pocket Pistol Of Navy Caliber. The engraving on the cylinder should say Stagecoach Holdup.
It should be marked as to caliber on the barrel.