I found in this forum somewhere
Quote:
Yes, this is the commonly called the production #.
• The '1' is for 911.
• The '0' is for coupe ( '1' would be for a Targa and '2' would be for a Karmann coupe which was not used in '73).
• The '3' is for 1973.
• The # 5XXX is the sequential # of the body shell.
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Bruno