Mid 20th Century French Glaze Test Plate, Orange-Brun Spectrum ducks A sweet little handmade

A sweet little handmade

but it looks to me like this one shows a couple of layers

It is little: approx 3” x 4 5/8”

I have no idea the story behind it

I believe there may be something carved in the bottom but I can't make it out if so

Mid 20th Century French Glaze Test Plate, Orange-Brun Spectrum ducks A sweet little handmadeI was thrilled to find a mid century Royal Copenhagen glaze test plate in shades of blue this summer and equally thrilled to find this unmarked French one, in autumnal shades of brown and orange, this week in Maine, feeling just right for the season. I've kept an eye out for these for years, and pretty much never come across them; they are scarce things, made for internal use at the studio or factory, to test and serve as reference for the specific