C is for Cookie! It's crescent moon or a cookie monster song. Tiny tabs on the ends of the C. Edges are not smoothed or bevel - these have clearly been stamped out of the metal and had nothing else done to them. Some tarnish and oxidization - you may need to polish them up a bit.
Metal components from a vintage warehouse sale - these were probably produced as custom items for a well-known fashion jewelry house, and these would be end of line when production changed. Lot of creative possibilities here!
40mm x 42mm x .9mm By the each.