Agree w/Horus. The general style would have not been very fashionable by WWII. It is .925 silver as you noted. Is the "A" mark enclosed in any kind of a shape (triangle, oval, etc)?
It is an amulet, or pendant.
The convertible crown mount (2 side holes or center hole for necklace) looks older, but without better hallmark information, hard to date it.
Most of the jewelry from WWII and before, which used Egyptian iconography, tended to be ornate and colorful, in line with the Egyptology craze that lasted from the 1900s-1930s. This piece is rather plain in comparison with only the beaded edge around the face for embellishment.
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ANA - EAC - TNA - SSDC - CCT #890
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