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.