Seldom exceed 60 to 70 USD or so
You have not yet asked a question, despite the question mark. The successor to the Forehand & Wadsworth Company, Forehand firearms were made from 1890 to 1902. Values are not high, but would depend on exact model and condition. Please note this is NOT a .38 Special, but a caliber .38 S&W.
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
Seldom exceed 80 USD
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.
38 special
A fine revolver.
The "J" frame is the Smith & Wesson small frame revolver such as the model 36 .38 special. The smallest frame, as in the model 36 Chief's Special.
No
Good revolver.
You will have to call S&W
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.
.44 Special is the correct ammunition.