Vintage silver ring...need help with Maker's Mark

[Crispin]

In area of heavy Spanish and English influence...Letters are ER with ellipse on bottom.

 

Amazon Forum Fav 👍

DR.ÖTEK Metal Detector, Waterproof Gold Detector, Pinpoint & Terrain Modes, Professional Metal Detector - Grab it through Amazon!

[Subterranean]

No doubt Native American made with the Kokopelli figure as a design. I checked NA Sterling hallmarks and could not find the ER listed, maybe hasn't been cataloged yet. Cool ring, Sub