HP 41 PPC ROM Production Run Total

[vervalin]

So, now we know of at least TWO that have a "date" stamp of 2220 (Late May, 1982) but we do not know "how" these happen to have this production date because it does not fit with the original production date of 1981 OR the later 250 unit production run of 1983.

The mystery deepens I guess???