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No published sn data available.
Rosco was one of several brands of inexpensive revolvers made by the firm of Röhm Gesellschaft (RG) in Sontheim West Germany. Many of these inexpensive guns were imported into this country prior to the Gun Control Act of 1968. Sorry, but you are unlikely to find a schematic- these were made in an era when you did not HAVE a schematic. To be painfully blunt, the RG revolvers of this ilk are of such low quality that they are not worth repairing.
$100
Unaware of any published data.
There is no real limit (other than practicality) of the smallest gun you can own. The smallest caliber firearm I now own is a .17 HMR. The smallest physical size is a Baby Hammerless revolver from 1920. It is a .22 Short revolver that is about 4.5 inches long, and was made to fit in a vest pocket. There ARE smaller guns.
10-40 USD
No published sn data.
If the revolver is an RG or Rohm, it is worth about $25-50. These were low cost, low quality firearms, and frequenly had frames made of metals other than steel.
Most likely made before 1968. 10-50 USD or so
The Slocum gun was a pocket revolver made by the Brooklyn Firearms company in the mid-1860s. They are relatively rare, but not as valuable as other guns of the same era.
Usually went by names not model numbers.
The .22 Short, was developed for Smith and Wesson's first revolver , in 1857.