To answer the first part of your question: It was made in 1969.
As for the second part of your question (How much is it worth)... If I asked you How much is my 57 Chevy worth, without giving you any description of it's current condition, I don't think you would be able to give me an estimate of any value. It's the same with airguns. It could be a GEM or a DOG. You need to give more information, Give it some sort of rating like It's in, poor, fair, good, very good or excellent condition. Then I have some way of giving you an estimate of value.
Also. The next time put your air gun question in the "Air Gun and Air Rifle" category and it won't take me 10 days to find the question.
The Benjamin 720 was made from 1947-1962. In good condition it would be worth around $80 to $105
Which model. Benjamin made about 20 different models. Also state the condition of the rifle.
The model 340 was made between 1969-1989. In very good condition it is worth between $85 and $100
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.....
This is obviously worth money buy I need the model number in order to answer you. Benjamin made several different models that were .22 Cal
The model 342 Rifle, was made between 1969-1992. In good condition it is worth between $65 to $85.
The first Benjamin model was the "St Louis model" made in 1899.
The Benjamin model 300 (Benjamin Franklin was a marketing gimmick name to sell rifles.) was made between 1934-1940. In good shape, today it is worth between $95 and $125
I don't believe Benjamin ever made a model 170, but they did make a model 177. Is this the BB gun you are asking about?
It would be worth around $105. This model was made from 1940 to 1969. If you have the original box it is worth 25% more.
This model was made between 1946-1985 and in V/G condition it is worth between $60 and $80 if it still working. see the link below for the Owners Manual
This model was made between 1959 - 85. In Excellent condition (just like new, no scratches, rust or dings) it is worth around $150 to $180