And I thought some of the stuff lloked rough when I found it! I could see the american picker guys pulling this unit out of a caved-in barn somewhere. They would stop off at an appraiser, who would immediately buy the unit to restore. At the end of the episode, the pickers would drop by the appraiser's shop, and see the thing completely new-looking.
From the pics you posted, it looks like 70's or early 80's tech at the latest. Your best bet is to look for a nameplate on the unit somewhere, as the older ones were mostly stamped, rather than printed. When they get really old, the numbers can still be read. Other than that, it looks as if the charge has been messed with: there's a bullet piercing valve on one line. From the discoloration, it looks like 3 suction lines (green from cold sweating) and the bullet on the discharge line (not as green from being hot). Can't really tell where the plumbing goes due to the close-up pics. As old as the unit is, it may be set up for R-12.
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