S&W 77A .22

I fettled one for a shooting buddy couple of months ago. Couldn't revive it by no means. Main problem was cocking pump pressure build-up and sealing of compression unit due to heavy handed treatment until I got my hands on.
Though my thread in our Austrian forum is mainly in German it shows a lot of pictures with English descriptions. So for those interested:
http://www.airgun-austria.com/t4377-...dw_77a_22.html

Crosman? No way. Smith & Wesson only. Production ceased in 1978.
Look here:
http://www.bluebookofgunvalues.com/A...d=SMITH_WESSON

You can still get spare parts for the pump/compression unit. You may try http://www.mac1airgunshop.com/

Could act as a nice but if you want higher power though painstaking plinker.
Accuracywise it will never be up to a more actual springer.