Unique O. B. McClintock safe
It was labeled as "O. B. McClintock". Oliver B. McClintock of Minneapolis, from what little I was able to find, "was the most prolific in alarm company sales to banks from the early 1900's to 1947 when it was taken over by Diebold" (https://gtjournal.tadl.org/2015/04/).
Here is the back of the door. Note the electrical contact and insulator at the top of the door, which I assume communicated with contacts within the safe at one time.
Here is the back of the door with the cover plate off. If you look closely you will see three wires at the top which have been cut. These would have been connected to the contact plate at the top of the back cover seen in the previous photo. I know one of the wires is connected to the lock, one is probably a ground wire, and destination of the third is still unknown.
This door was set up with a system of wires and contacts, some of which were cut or removed. Luckily, the lock contacts were present, and it was just a matter of getting the correct brass mounting screws and reattaching it.
A closeup of the bolt carrier shows this spring tab, which I'm sure was part of the alarm system. I don't see any wires under the carrier, or any evidence of anything that would have activated the plunger. It's a mystery.
The under side of the carrier has some clues, but I don't quite know what to make of them. Under the spring plunger is a screw, and across from the plunger is a threaded hole with a circular pattern showing evidence of having had some part attached.
I didn't see any wires beneath the carrier, but closer scrutiny may be in order. Someday I may disassemble the door to trace where the mystery wire is routed.
I thought maybe the dial might have had some wiring, so I removed the dial to check. Under the dial you can see the original wood grain paint job. You can also see the insulation inside the door. There was no tube, and the insulation, upon magnification, has fibers incorporated in the fill, which is almost certainly asbestos. There was no wiring seen on the dial side of the door. In the next post, we'll delve into the M6730 lock on this door.