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Serial number charts for vintage Neumann microphones

Anybody know if there exists a serial number chart for vintage Neumann mics ? Like the ones available for old grand pianos where you can look up the serial number and get to know the year it's manufactured in. Just out of curiosity (no big deal if I never know) I'd like to know what year my vintage Neumann is made. The serial number is there so it should not be impossible... Any tips ?