Benjamin made a model 1300 air pistol not a air rifle. It would be worth between $130-$155 in VG shape They were made between 1959-1964 They did make a 3100 air rifle... If you have a 1300 rifle then I do not know the value.....
The 310 series of air rifles were made between 1940 to 1969. Today Crosman air gun co owns the Benjamin line of air products. If you go to the Crosman link below you will find the exact year of your rifle if you can read the Serial number it will began with an "H".
What condition is it in. That determines the value.
My documents only list the overall dates it was made between . 1958 to 1984 see the link below
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This air rifle was made in 1965.
Which model. Benjamin made about 20 different models. Also state the condition of the rifle.
It was made in 1978
It was made in 1978. Today Crosman owns the Benjamin line of air guns.
The first Benjamin model was the "St Louis model" made in 1899.
It was made between 1992 to 1998
It was made in 1974