4 ring day, need help IDing one

[dc426]

Met Cliff at one of our beaches after work today. It was a little choppy but the tide was falling and we made the best of it. I got lucky a got a nice old LA France 10K ring (6.6g) with a small real diamond. The other two on the left are silver and the gold colored one I'm not sure about. It seems to stand up to the 10K test. It only has the marking inside shown in the picture. It appears to have been in the water a very long time. Does anyone know that mark?
Thanks.
DC

 

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[tnt-k9]

Check this link to an old TNET post

http://www.treasurenet.com/forums/what/129173-jeweler-s-mark.html

Hope this helps. Nice finds by the way!

Uncas Manufacturing Company, Providence, Rhode Island. Founded by Vincent Sorrentino in 1911. Acquired Vargas Mfg. Company in 1998. Might still be in business today.