To distinguish between the .32 caliber and .38 caliber Iver Johnson revolvers, you can look at the markings on the barrel or frame, which typically indicate the caliber. Additionally, the size of the cylinder will differ; the .38 caliber revolver will have a larger cylinder to accommodate the larger cartridges. If you have access to the ammunition, comparing the cartridge sizes directly can also help identify the caliber.
How do I open an Iver johnson 32 cal pistol?
Without knowing the model and caliber, we can't tell. A serial number ALONE does not identify a gun.
For $30, you can get a factory letter that will tell you in what configuration it left the factory, when, etc., and a short history of the model.
A Great source of information on this firearm (and most other Iver Johnson firearms) is the book by W.E. Goforth titled, "Iver-Johnson Arms & Cycle Works Firearms 1871-1993".
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"U. S. Revolver Co." weapons were made by Iver Johnson. It was most likely made 1900 - 1920. It is a curio, and if in very good condition may have a very attractive value to a collector, but that's the extent of what I can tell you.
We can't tell you anything about your revolver from the serial number alone. If there is no model name or number marked on it, try to locate it in Flayderman's Guide to Antique American Firearms or Gun Trader's Guide. Both of these books should be available at your local library.
Hercules was made by Iver Johnson from 1918-1943, Hercules name dropped in late 30's!
Is it possible? Yes. Will we tell you how? Absolutely not.
Measure the diameter of the opening, (bore), at the muzzle of the barrel.
.32 cal. black powder
www.e-gunparts.com depending on what you need. I can tell you they don't have a barrel!