you need to state the model number not the serial number to get and estimate of value.
cal 22 model 342
It was made sometime between 1969-92.
serial number T170160 would have been made in 1973.
This pistol has not been made since 1941. Your best bet is the web, someone like gun brokers or guns America.
This is the best I can do. (see the link below)
You do have an old one. The model 122 at the end of the barrel indicated that it is a .22 caliber pellet gun. There also was a model 177 that is a .177 caliber pellet gun and a model 100 that is a BB gun. All these models were first introduced in 1935 and ran until 1941. these were the first production air guns by Benjamin. The name Franklin was added as a marketing gimmick and had nothing to do with Ben Franklin. today Crosman owns both the Benjamin and Sheridan line of airguns. If you want a estimate of value then give it a rating like Poor, Fair, Good, Very-Good or Excellent and I will try to give you an answer.
It was made from 1946 to 1985.
The model 132 was made from 1942 to 1986.
T427432 was made in 1982.
If it's T123136 it was made in 1972
It was made sometime between 1969-92.
Around $50
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.
I suggest you go to Crosman.com and click on Support and ask your question there. Crosman owns the Benjamin line of air rifles
1980 see the link below. See the link for your date of manufacture
This pistol has not been made since 1941. Your best bet is the web, someone like gun brokers or guns America.
serial number T170160 would have been made in 1973.
This is the best I can do. (see the link below)