Weird, the GP are still the old style and the primer pump is still the original screw down type. I used the Russian VIN site and everything checks out as a 1979. The AC system looks exactly like the one in my '80. Engine is super clean though, so it might have been worked over at some point and refitted with the R4 system? Still, hoses to/from the cabin look like factory originals but IDK if those hoses on the York systems were different or not.

Also, PO reupholstered, but maintained the stock MBTex/color and "winged" headrests. Everything was stock when I bought it, and even the battery was MB-branded, so it would seem odd that he wouldn't have also kept the AC system stock.

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Current Mercedes
1979 maple yellow 240D 4-speed

Gone and fondly remembered:
1980 orient red 240D 4-speed

Gone and NOT fondly remembered:
1982 Chna Blue 300TD

Other car in the stable:
2013 VW Jetta Sportwagen TDI / 6-speed MT