||Hand written on outside frame.
||Etched in top right corner on component side.
||MSA 09451 C
||Stamped in black on circuit side.
overall: 3/4 in x 5 1/2 in x 11 in
The module consists of transistors, power resistors, resistors, capacitors and diodes. The frame is a plated metal with a connector having 16 socket contacts. The frame is for grounding purposes.