Hi Doug,
I’m not sure that Quirk Brothers were actually a manufacturer. I have only found listings which would indicate that they were simply a “sales Agent” for B. G. Wilder & Company - the patent holder, and manufacturer after Silas Herring broke ties with Wilder, and not a manufacturer or maker of these safes.
The name plaque on the front of your safe is basically the “B.G. Wilder Patentee & Manufacturer” plaque, but with Quirk Brothers name. The “Depot” indicating a sales location.
The address for Quirk Brothers was listed as No. 98 Maiden Lane, New York, which is a sales area, not a manufacturing area of the city.
Interesting note on the pivot post of the lock. I’ll have to go back through my photos to see if I have any similar locks.
