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Hi, around early 1975 the HP-21/25 were sold with a new-style stamped serial number. However, after the introduction of these models, production of some of the classic models continued for a shorter or longer periode.

Therefore, does anyone know of HP-45/55/65/80 with stamped serial numbers, or did they all continue with the metal sticker?

Regards
Bo Kristoffersen
Copenhagen/Denmark

I don't know if you would class the HP67 as a true classic HP, but mine has the serial number heat stamped into it. I'd guess all HP67's do.