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 ▼ Edwin Morales Junior Member Posts: 17 Threads: 8 Joined: Jan 1970 07-30-2001, 02:27 PM HP 65 was introduced January 1974. First series are 1333? Question: There are series 1340, for example? or all the calculators from Jan 1974 are 1333? ▼ David Smith Posting Freak Posts: 1,788 Threads: 36 Joined: Aug 2007 07-30-2001, 05:10 PM Although HP calls the first digits of their serial number the week of production, this is generally not so. It seems it is more like a production run number. I have seen 1333 units with serial numbers over 30,000... HP did not have the production capacity to crank out 30,000 of these units in one week. ▼ Edwin Morales Junior Member Posts: 17 Threads: 8 Joined: Jan 1970 07-30-2001, 06:51 PM Sounds like all hp 65 sold January 1974 were 1333.

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