Source for nice but simple sterling silver watch faces

I have been approached to make some watches with some of my metal
bracelet designs for the bands. I’m familiar with the watch faces
available from Rio Grande (I like the ones with the mother of pearl
faces) but was wondering if anyone knows of some other source for
them. I was thinking of making 3 or 4, each with different sized
faces since some ladies like small watches and others like larger
ones and Rio just has the two sizes (men’s and women’s). I prefer
them to be plain – no decorative engraving or anything fancy.

Thanks, Elizabeth