and there you find your model you are looking for, now on parts you can by comparing part numbers see when the parts change, it could be a little work but sometimes that happens the early first second series appear to have 2 different piston seals one a o-ring and one a cup and the cup is on the last model listed, it is trial and error I don't own one of these but hat is how I would do any gun if you have parts diagrams and years and years of different models most of the parts are the same but with some updates as time goes on another way is open it up and look Crosman should have your parts and would be the fastest and cheap source get the part numbers and give them a call good luck on your repair mike
Seems this gun is of the crossover era of July 1975. It has the older style pump cup, but has the plastic stock of the post July 1975 model, VS. the wood stock shown for pre July 1975 model. Gun was bought new late 1975.
Owner has printed copies of both EVP's and will be calling Crosman to get parts on the way.
Finally got the money from the owner, and the returnable parts were sent on their way to jgairguns yesterday. One has to return the pump end and exhaust valve with order and payment. Guessing they rebuild them.
Debating on whether to do some reblueing on a few of the pieces. Owner said it was up to me, he really didn't care one way or the other.
No spit and polish done. Got it all back together today, and it works good, but not great. Bit of blowby at the barrel/bolt area, (feel it on my face). Thought that age/use itself warranted replacing those parts but owner wanted to keep cost down.
I'll be dropping it off at his place tomorrow after work. We shall see if he deems that more work is to be done.