Vintage Ruby and Sapphire Pin Gold Hallmark?

by Adele
(Long Beach, NY, USA)

I have a vintage pin with the following hallmark on a tab in the back: GW in a rounded rectangle with 14K beneath it.

It is stamped on a tiny tag attached to the back of the pin. It consists of GW enclosed in a box that looks something like this: (_). I'd appreciate knowing what the GW means.

There are 6 rubies and 7 sapphires. It measures 2" in height and 1 1/2" in width. The pin closes with a locking mechanism for security.

Any information you can give me will be greatly appreciated, including country of origin and an approximate value of the pin.

Thank you for your attention and any information you can give me. Unfortunately, I cannot take a picture of the hallmark.
Thank you

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