Stamped on the component side at the insertion end
Printed on the soder side and stamped on the component side
overall: 1/2 in x 5 1/2 in x 4 5/8 in
Standard Modular System (SMS) card of unknown function. There are discrete transistors and other components. There is an opaque cover over the components. The model number 5300509 is printed in solder on each of these modules.