Welcome to the Forum. You have a 38 Double Action Second Model shipped from the factory in the mid-1880s. Condition looks well worn and there is the broken hard rubber stock. This is an antique, but with the condition I would venture an estimate of $200 if working. Ammunition is called 38 S&W.

Original hard rubber stocks come up for sale on ebay, Gunbroker, etc. Does the right stock have a serial number? Any replacement will not be original to your revolver, but would improve the appearance and shooting. Vintage Gun Grips also reproduction stocks for the 38 DA, so at least one way or the other, you should be able to find good replacements.