Last 71B?

[rprosperi]

(03-07-2015 08:53 AM)Didier Lachieze Wrote:  This 2 months difference may be explained if the year in the serial number is not the calendar year but the hp fiscal year as mentioned here.

Makes sense, and most likely solves this mystery. Already in the early 80's the power of financial control was already worming its way into HP machinery.