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Today I used my HP 82104A card reader.
When I took a look at the serial number I realized it should not be valid:


57th week of 1980? What went wrong in those days? Did they forget to switch the year to 1981 and recount the weeks from 01?
Responsable manager still in X-Mas holidays?
Anybody recognized such a strange thing in the past? Are there also calcs outside with an invalid week?

For your model they used a lunar calendar or 1980 must have been a strange leap year

My HP-82240B printer 3653I50312 is manufactured 1996 in Indonesia. But they don't have an extra christmas week there, 1996 January 1st was a Monday and it was a leap year, thus the printer must have been manufactured at 1996/12/30 or 1996/12/31 based on the gregorian solar calendar.

These days we have another one on TAS, 2058S...
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