Dr. Pepper Wire Bottle Opener

I have read up on these openers and the history of Dr Pepper and have learned that these were promotional advertising items and the slogan stamped on this opener was in use between 1920 and 1940. I have not found much on when these particular openers were made (20's, 30's, or 40's) or how common they were. I have seen a lot of Coke openers but never a Dr. Pepper (except this one).

This one was in a canvas bag my grandfather kept his stencils in. He used these during the Great Depression to paint names and addresses on mailboxes for extra income. The dark coloring is from rust - I had to brush a lot off to be able to read the fine print (Vaughn Chicago). Though the stencils were brass, the opener is steel and was at the bottom of the bag which spent most of it's days on a concrete floor. I imagine the moisture wicked through.

Just hoping to learn more about the setting of my opener.