There are no other stamps or markings other than Trifari with a crown over the T making it a Crown Trifari piece. Trifari is well known for its signature costume jewelry as early as 1940's and was (so I was told by someone who read about it) favored by many upper crust such as Marilyn Monroe and Mamie Eisenhower, to name a couple, due to its' excellent craftsmanship. That's the best I can tell you as I am no expert and all the things I am listing in the way of jewelry came from my mother-in-law's estate and were not in original boxes, etc. Thank you for your interest and for visiting my auctions! I have many vintage Christmas pieces listed right now if you have time to look & I will return the favor!