Vintage Art Deco Mexican Sterling Silver Ashtray. Attributed to Spratling Taxco

Description

I have for sale a vintage art deco style, Mexican silver ashtray.
It may have been designed by William Spratling at Taxco, Mexico. But I'm not sure.
On the side of the bowl is the initials:  RSF
The height of the piece is 2 1/4" and the weight is 2.65 toz.
It is in great condition except for handling wear to the finish, and minor dings and tarnish on the surface.
Thanks for looking. Good luck!