Here is a NOS (new old stock) Northern Electric vault lock for a 3 slot payphone and 1 slot payphone vault door. It is the model # NE22.
This will also fit Northern Electric and Western Electric upper housings. This is an excellent lock for 3 slot payphone vault doors including Northern Electric and Western Electric vault doors. You get 1 key. Because of the round key head it makes it look like the older style lock.
We also have the special screws to mount these locks sold separately.
If you want an extra key we have them for $10 Let us know so we can invoice you thru PayPal for the extra key.