Quote:
Mod 17-4 SN 25K53XX
Mod 57 SN N8851XX there is no number after the Mod 57
Mod 66-3 SNBFH37XX
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Mod 17-4 SN 25K53XX = 1978
Mod 57 SN N8851XX there is no number after the Mod 57 = N800000 range ran from 1980 to 83 so yours would likely be closer to 1983.
Mod 66-3 SN BFH37XX = late 1989/ early 90.
Jim