Which Model are you asking about.
It depends on the Model, Age and Condition of the pistol. Benjamin pistols are still being made today. Benjamin is currently owned by Crosman air gun company.
Your raven model MP 25 is not worth much.In the description you describe the current value is kisted at 60 dollars.
The model 100 was made between 1935-1941.
Benjamin made this model from 1946 to 1985, but did not start serializing them until 1957. I also have a Benjamin Franklin that has no serial number. Before 1957 it is not possible to set an exact date. Just know it's OLD. The 137 is a .177 caliber pellet pistol the 132 is a .22 caliber pistol and the 130 is a BB pistol.
It's usually on the breech or the very back of the pistol.
It was made in 1960
It was made from 1946 to 1985.
They were made between 1938 to 1941
It started in 1946 to 1985
Under $100.
Benjamin model EB22. Crosman model 2240. Benjamin Marauder Air or C02 Pistol. All 3 of these are .22 cal C02 air pistols, There are several others but they are spring or pneumatic not C02 systems