The model 117 is part of the 110 series of Benjamin airguns. It included models 110, 112 and 117 they were made between 1938-1941. In order to get an estimate of value you need to state the condition of the gun. From Excellent to Poor and is it still working. If you would like a copy of the owners manual see the link below. Today Crosman owns Benjamin airguns.
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This is a .22 caliber air pistol not a .177 caliber pistol. See the link below for the owners manual.
it would be worth between $45 and $65.
Most all C02 air guns use the common 12 gram C02 cartrage.
It was made in 1976. It's part of a series of 3 pistols (130 Series). It's either a 130 - BB, a 132 - .22 cal or a 137 - .177 cal pistol.
This is the best I can do. (see the link below)