Printed in solder near the insertion end of the block
Stamped into the front of the aluminum frame
Stamped into the aluminum side of the board
overall: 1/4 in x 4 1/2 in x 7 in
The object consists of a green board with a silver frame and a blue plastic connector. On one side there are several transistors and resistors. On the other side there is a circuit printed in solder and a lettered grid A-Z. There is a pink tag attached indicating the block type.