have a look at our Monaco section, included in the frame below, and you will see that there are some verisons that had the date and some versions that didn't. The only version that did not have the date is the three-register, manual wind, Reference 73633, available in blue and charcoal.
Serial numbers and Reference numbers appear between the lugs, so if it doesn't have a date, it should have three registers, with the number 73633 between the lugs.
Thanks for posting this question.
Jeff
Vintage Monacos
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: Does anyone know if an original heuer monaco
: should have a date on the dial and what
: serial number it should have?