HP 65 serial number

[Edwin Morales]

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]

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]

Sounds like all hp 65 sold January 1974 were 1333.