Dear Randy and MMD,  When we repaint a piano plate that has
rubber-stamped decorations, I photograph the original decoration, with
a 6" ruler across the bottom of the photo, and take the photo to a
rubber stamp shop.  They inexpensively reproduce the rubber stamp from
the photo.

You'll also need special quick-drying ink and a special stamp pad, also
available from the rubber stamp shop.  Ordinary stamp pad ink won't
dry, and will continue to smear days after the impression is made.

I haven't needed any stamps made since I got my digital camera, but
I would think an up-to-date shop can work from digital files too.

Incidentally, for the fine pinstriping that is often found on piano
plates (alone, or combined with rubber stamps), I've been successful at
finding inexpensive but qualified itinerant pinstripers by inquiring at
custom van shops.

Art Reblitz