It was made from 1946 to 1985.
The model 132 was made from 1942 to 1986.
T427432 was made in 1982.
It was made sometime between 1969-92.
Around $50
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 depends on the model and the caliber of the Pellet gun.
It all depends on the model and who made the pellet gun. I suggest that you re-post the queston with the model and make of the pellet gun to get an answer.
Which model
I suggest you go to Crosman.com and click on Support and ask your question there. Crosman owns the Benjamin line of air rifles
The Benjamin model 342 ( Currently owned by Crosman Airgun Co) was made between 1969 - 92. In fair working condition it is worth between $50-$70.