SRC  Lepel Pin - Scientific Research Corporation?

Another one of these couldn't be found when searching online.

However Scientific Research Corporation did come up. 

SRC Inc. is a defense industry company.

The diameter of the pin is approximately 24mm - same size as a U.S. quarter.

Impressive clasp on the back with an engraved number

International buyers --Please note:  Import duties taxes and charges are not included in the item's price or shipping cost.

These charges are the buyer's responsibility.

Please check with your country's customs office to determine what these additional costs will be prior to bidding or buying.