If it appears to be really old it may be on the very back of the barrel on the rear cap. Usually it's on the side of the loading chamber. Benjamin made a model called the 177 it referred to the caliber but was also the model number. For a period of time Benjamin also did not put serial numbers on their guns. Today Crosman Corp owns and produces the Benjamin and the Sheridan line of airguns.
you need to state the model number not the serial number to get and estimate of value.
It was made sometime between 1969-92.
It was made in 1980
It was made in 1961
Please state the model number of the rifle/gun so it can be identified. During the 30's and 60's Benjamin guns were labeled Benjamin Franklin as a marketing ploy. All of them are really Benjamin's. They were developed by Walter Benjamin not Benjamin Franklin
T427432 was made in 1982.
It was made from 1946 to 1985.
The model 132 was made from 1942 to 1986.
you need to state the model number not the serial number to get and estimate of value.
1980 see the link below. See the link for your date of manufacture
It was made sometime between 1969-92.
Around $50
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 was made in 1975
I suggest you go to Crosman.com and click on Support and ask your question there. Crosman owns the Benjamin line of air rifles
It was made in 1980
I think you answered your own question. It's a combination BB and pellet rifle. I can add this information. It was made between 1969-86. It a pump rifle using the forearm as a pump. The name Benjamin Franklin was a marketing gimmick. Ben Franklin had nothing to do with it. Walter Benjamin started the company in 1899 and today it's owned by Crosman Corp.