VINTAGE Master Lock Co. Key Fob

Very unique VINTAGE Master Lock Co Coin Key Fob. I believe this was used to hold coins for parking meters or pay telephones. I've slightly cleaned this up, didn't want to ruin the spring inside which depressed nicely. (Penny not included)😁 I'm leaning towards this being Aluminum. Milwaukee Wis. USA stamped F-BN Please review all photos and ask any questions you may have prior to purchase. DISCLOSURE: OUR ITEMS ARE VINTAGE PRE-LOVED, SHOW NORMAL SIGNS OF WEAR, FADE, STAINS, HOLES, AGE, AND ARE NOT PERFECT 🐓