It would depend on the make and model. The .38 Special was introduced in about 1898, so it had been on the market a few years. An average price may have been around $10-14. As a suggestion, there have been several reprints of the early Sears catalogs- which your library can get on an inter library loan- and Sears DID sell handguns- by mail. See what date you can find close to 1915, get the catalog, and see what Sears sold them for. PS- in the 1896 catalog, Sears had a .22 revolver for 69 cents.
38 special is only a revolver caliber. that's like saying a 44 magnum revolver or a 500 special revolver. a revolver is a revolver
It depends on what you mean. A .38 revolver may be a .38 special, but there are other types of .38 besides just the special round.
Your Rossi revolver fires the .38 special cartridge.
A ".38 +P revolver" is simply a .38 Special revolver which is rated to fire +P loads. It's still a .38 Special, and the +P doesn't change the dimensions of the round itself.
Depending on who made it and its condition; 100-1000 USD
No, the rimless .38 Super is not compatible with the rimmed .38 Special.
38 special
yes
38 special.
No. The case diameter is too large to chamber in a 38 Special.
Good revolver.
No