This image shows the entrance to the coffee shop at the Mason Hotel, which at the time housed the J. M. Davis gun collection, displayed throughout the hotel on the walls of various public spaces.
MWM Photo Gravure Postcards, MWM, Aurora, Mo.
The description states:
J. M. DAVIS Gun Collection
Largest Individual Gun Collection in U. S. A.
–It is believed that the man pictured is J. M. Davis.
Comparing this image to the one posted previously, you can see the the right edge of the previous card matches up with the left edge of this card, giving a more panoramic view of the lobby as it looks towards the coffee shop.
This card likely dates from the 1940s.