I can't quite make out if it is a design or initials on top on one another. Hopefully one of you recognize it or can make out what it is. Thanks for looking!
I don't believe it is costume. The store I bought it from tested it as 18K. I tried to take some better pics as I see the "k" you mentioned in the previous pic (good eyes) but I don't think it really is a K. Maybe this is a dumb question, but is the mark always right side up with the jewelry? In the new pics I included the pin stem and the mark would be above the stem wearing right side up. To me it looks like a "P" with a foot on its side and a larger, reverse "2" on its side. Sigh, I can't decifer what it really is. It
I'm seeing this from a different angle. Kgizo,I saw more photos of the brooch on your other thread.
It looks like a T over a P.
The T and P look like they are written in script.
This is an aside (I think it looks like a cursive T& P as well), but if any of you have Krementz jewelry and are disappointed that it might be costume ... don't be, necessarily! They actually made some very high-end pieces around the turn of the century. Quick link to a Pinterest page with a good representative sampling: