I have for sale a vintage Yale lock.  Probably dates to the 1930s or 1940s based on the design.  The lock is currently locked and the key has snapped off in the lock.  Half of the snapped key is zip tied to the shank.  Lock measures 3" tall, 2 1/4" wide, and is about 15/16" thick.

The lock is marked "made for bell system" on the back.  there are a number of scratches on the bottom next to the keyhole, but no major damage.  Pictures show it off well.

Multiple shipping options in the US, eBay international shipping for overseas buyers.  Local pick up available near Madison, WI.  

I have a bunch of other vintage locks on eBay right now too.  Send a message if you'd like to make a deal for multiple items!