Key Blank For USPS Mailbox, Reverse Profile : Tools & Home Improvement - Amazon.com
KEY - BLANK - Overhead Door Parts Online
Vintage USPS Brass Do Not Duplicate Key, no. and 50 similar items
One New National Cabinet Lock USPS Mailbox Key - key code 4225PO | eBay
Found in with some of Dads old USPS(mailman) stuff. Blank key with a pivot and spring. Labeled YALE&TOWNE MFG.CO. Cant figure out what the use is for the pivot and spring. Some