silverwings:
Mod. 60/R219183: 1978
Mod. 36/J510428: 1976-77 (pretty much right in the middle of the range for those years).
Mod. 39/64722: The info in SCSW is not very specific. SN 1001 was 1954, 115000 was 1970. You can interpolate between those two ends of the range and get an idea, but it will only be approximate.
yarman: 1979 (by 1984 they had switched over to the 3-letter SN prefix). Yours should also have a pinned barrel, which dates it to pre-1982. BTW, the number in the yoke is not an SN. That's called an assembly number and it's used to keep track of fitted parts during manufacture.
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