While waiting for an answer on the author of the Duncan medal, I'll ask about one more.
There is such a medal in the collection. Not much information. Author unknown. Year of manufacture unknown. Mintage unknown. It's called Robbins Company Storecard. D = 79.3 mm. Manufacturer: Robbins Company.

I have roughly figured out the year of creation. There are catalogs for this company. One of them is dated 1928 and has a similar image on the flyleaf.

There is an interesting continuation... It is also unclear in what year the Utopian Club Medal appeared. The manufacturer is the same - this can be seen from the reverse. It was made in bronze and so-called. silvered bronze, with a diameter of 50 mm and less.

The obverse features an allusion to the god Vulcan making the shield of Aeneas. An interesting detail is noted - the Phrygian cap as a symbol of freedom. On the shield you can make out two inscriptions - CELLINI and LALIQUE. Two famous jewelry companies.

The author's signature is a combination of two letters. Exactly J and either H, or a peculiar K. And this version has the signature of the author. Any guesses who?
I would like to see J and K - Julio Kilenyi. But I can say for sure that I have never seen such a signature from Kilenyi.
Here are Kilenyi's signatures on medals from my collection.
*** Edited by Staff to clarify topic title. Please put as much info in the title as you can, they are very important. ***