Master Lock A1105RED, No. A1105 Red Anodized Aluminum Safety Padlock (Pack of 24 pcs) - Amazon.com
The first American and Master lock locks to join my collection, though after some research it seems they are essentially the same lock... : r/lockpicking
AMERICAN LOCK SAFETY LOCKOUT SET OF 6 ALUMINUM A1105 PADLOCKS AND MASTER HASP | eBay