Forum: Patent & Propriety Locks
Moderator: awaiting/TBA | Post in this forum locks that demonstrate a Patent, or a Security Feature or even a Brand Name or Logo. You will find here Locks for: Doors, Furniture, Safes, Vaults, including: Combination Locks for Safes, Key Locks for Safes, Time Locks & Bolt Motors, Unit Locks, etc.
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Never seen a mappins patent with only 4 guards. Odd. It's chicken and egg, I find that the key will not want to go in until it's already cut as the sharp edge on the blank does not move easily...
Is it a Mappin