1920's chest safe

[abeavers]

Good evening guys/ gals
My name is Allan Beavers
I am head of Technical services for Wilson Safe Company.
I have a customer who has this chest that is half safe and half writing desk.
She locked the key for the safe door inside the safe.
This indicates that the keylock either has an auto lock feature or is a latch setup.
First off there is no labels or logo on it.
The chest has 4 design faces that look like drawers
The top one is a flip down writing desk (she has the keys for that and the lock is the center keyhole seen in the picture.
The safe door is like a regular swing door that encompasses the bottom 3 design faces.
The key holes visible in the pictures are false.
In the 3rd picture on the bottom middle design you can see a brass plate with 4 holes vertical to the door.
This is the actual keylock for the door.
The top hole (#1) and the 3rd and 4th holes are non functioning (I think) the customer says that the key turns 180 degrees and stops.
The 2nd hole is the actual keylock
The key is described as a barrel key. The customer cannot remember if the groves are circular going around the outside of the shaft, (as in a lagard 2200 keylock). Or if the groves run horizontal like an Ace (bike) lock.
Don't know if the lock is a latch or spring loaded bolt work.
I'm hoping someone can identify the safe for me before I try to open it.
Anyway here are the 3 pics of the unit