Today Crosman air gun company in New York owns both the Benjamin and Sheridan line of airguns. And Yes they still make both of them.
See the link below.
They are still in production today. There are several models available.
Benjamin ( who is owned by Crosman air gun) recommends 10 pumps. Over pumping may damage the rifle. You can still get the owners manual for this rifle for free. Go to the Crosman link below and click on "Download a manual" at the bottom of the web page, then click on Benjamin and locate your rifle.
He is dead. So the answer is No.
If you know who made it, and they are still in business, probably.
The company is still in business.
The Value of the rifle is determined by the current condition that its in and if it is still working. You will have to give more information is it in Excellent, Very Good, Good, Fair or Poor condition.
Contact the maker if still in business. If not, try the Blue Book of Gun Values.
Crosman still has the parts manual for all it's rifles. On the home page click on "Download a Manual." Crosman owns Benjamin. see the link below
Benjamin made several different rifles. Please state the model number (It's most likely on the barrel) and the condition of the rifle to get an estimate of value. Is it still working? Is it in Excellent, Very good, Good, Fair or Poor condition?
In order to give you an estimate of value you will have to state the model number and the current condition of the rifle. Does it still hold air? Is it in poor, fair, good, very good or excellent condition?
If the rifle is still under warranty then you can send it back to Crosman. Crosman owns Benjamin and Sheridan brand of air guns. (See the #1 link below) if it is an older one, then Crosman offers a service to locate repair shops that repair older Crosman, Benjamin and Sheridan products. see the #2 link below.
Benjamin models E, F, and G were made during this time period. Which model are you asking about? Also what condition is the rifle in? Does it still hold air and work. All this is necessary in order to answer you.