VME Power Supply

CRANE interpoint
A Crane Co. Company
VME28PS-B Prototype
P/N 40000-001
SN 0002P
Date Code 0106
Redmond WA, USA
CAGE 50821

VMEbus (Versa Module Europa bus) is a computer bus standard, originally developed for the Motorola 68000 line of CPUs, but later widely used for many applications and standardized by the IEC as ANSI/IEEE 1014-1987. It is physically based on Eurocard sizes, mechanicals and connectors (DIN 41612), but uses its own signalling system, which Eurocard does not define. It was first developed in 1981 and continues to see widespread use today..
A prototype power supply module in a form factor that is compatible with the VME (Versa Module European) chassis standard.

It bears a second, smaller, ID label marked:
"Power Supply
Part No. XD00722/020
Serial No. 0002P
NSN No.
Manufacturers Code 50821
Mfg. Date 2001"
https://en.wikipedia.org/wiki/VMEbus