Recognize This Maker's Mark on Vintage Sterling Ring?

[Erik in NJ]

When I dug this ring today I thought it was junk out of a gumball machine. Closer inspection revealed it was actually a very nicely made vintage piece. It has a large emerald cut aquamarine stone and what appears to be small diamonds (real or fake) on either side.

Any ideas on the maker's mark which looks like an EK with arrow thru the E? I've also posted a view of the ring from the bottom. Thanks for any info.

Update: After additional cleaning, it's actually a U (not an E) with an arrow going through it. The back of the arrow has a simple V-shaped split feather which I thought was a K.

 

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[Back-of-the-boat]

Uncas jewelry mark/ U with arrow going through you can Google the mark they also have the U with two arrows on either side pointed inward.

 

[Erik in NJ]

Thanks BOTB! Yes, it is Uncas...started in 1920 which is the correct time frame of other items I've found at this house.

Uncas jewelry mark/ U with arrow going through you can Google the mark they also have the U with two arrows on either side pointed inward.