Found on top of smaller rectanular Begiun component
Printed in silver on circuit side
overall: 1 in x 3 1/2 in x 5 7/8 in
This circuit board has two large rectangular components. They read "MERCURY WETTED CONACT RELAY". "GD" is handwritten at the extraction end of the componenet side in pencil. There are two inspection stamps at the extraction end of the module.