I seem to recall once seeing a table that showed how to read serial numbers on classic HP calculators to get the month and year it was manufactured. Can somebody point me to the table or website?
Thanks.
The older numbers prior to China:
aabb@xxxxxx
60 + aa = year
bb = week
@ = country A - America (U.S.A.), B = Brazil, S = Singapore, M = Mexico. Others can add to or correct my country codes.
xxxxxx = serial number.
2152A123456. Is 1981, 52nd week, America, # 123456
Thanks, everyone!
It looks like my HP-80 (1247A) is from the first week of production. My HP-35, type 4 (1346A) is from the second week of production of type 4.
Most interesting.
Thanks!