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Turns out it is a third variant. Judging by the breakdowns found here: https://drive.google.com/file/d/0B2hkfoL4OoEfSC1VMVFWeUpTa1U/view Matches the pre 1975 models Taking closer look at the gun compared to the crosman site, forend is definitely wood. 

I

That' why I'm here.. according to https://www.crosman.com/discover/crosman/crosman-product-dates, the 1982 model had plastic bolt.. mine is brass Also, in looking a replacement parts, this appears to have “old style ” valve, and piston cup this model also predates the mechanism with trigger...

 Looking for some info. I picked up this old Crosman powermaster 760 from a flee market for $7. Won't pressure at all, took it apart, appears the piston cup was torn. I'm wondering if anyone can identify the variant of the rifle. Serial number 05825197