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Yes. The model 77A was made between 1971-78
There is a very long story behind this question But here is the short version. S&W was purchased by Bangor Punta in 1965, with the help of a former Crosman Engineer the 77A was developed After several moves back and forth from Florida to Massachusetts Bangor decided to sell the Airgun division to Daisy Airgun in 1980 but had dropped the 77A model in 1978. I don't know of any diagrams for the 77A but it is a forerunner of the Daisy Power-line models. I would try to contact Daisy airgun to see if they "may" be able to help. See the related link at the bottom.
Have you tried winchester,s own web site first?if you had no luck,maybe numrich gun parts corp.may have one,or you might find one on E-bay.
At a Chevy dealer
it will be like putting S in horizontal position
The address of the Hochheim Historical Foundation is: 500 Us Highway 77A S, Yoakum, TX 77995-1318
Request one from S&W
Library is the best place for that Saves buying a book
Blue Book of Gun Values
YOu will have to call S&W to find out.
Without the sn, you will have to call S&W to find out.
You will have to call s&w to find out.