Background:
Eff-eff locks are a type of locking mechanism often used in high-security applications. They feature a design that incorporates multiple levers or pins, making them more difficult to pick or bypass compared to standard locks. The name "eff-eff" comes from the German company "Eff-Eff," which specializes in the manufacture of security locks and systems.
This vintage lapel pin ad features the Eff-Eff German Lock Company's "Electric Locking World Wide" slogan. The pin is a perfect addition to any advertising or pinback collection.
See photos for details, condition or flaws, and relative size. The pin in the photo is the one that you will receive. Shipping is combined on multiple orders. When purchasing two or more pins, a refund for combined shipping will be issued upon shipment.