Early (earliest?) HP-41C find.

[CY-CL]

One week ago, was sold on eBay another prototype. It was declared as 1901A00043, but this is not correct, because the backside is from a production run “warranty” HP-41. And the CPU-Board contains three NUT Rom’s from a later production date as them from 1916A00066 Prototype.

The correct S/N would about 1916A00100 regarding the production date from the NUT Rom's.