The Apollo Serial Number seems to be of the form:
AMFA XXXXW YYM
AMFA - AMF Apollo
XXXX - The Serial Number, Sequential from 1 to how many were made
W - Who knows What??
YY - Year of manufacture.
M - Month of manufacture A through L for Jan through Dec
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THUS:
Serial Number AMFA0402M79G
was the 402 boat made and was made in July of 1979.