Topic: Strange textured slumped glass dish, white enamel base

[David E]

Found this rather strange dish today

It has a quilt-like textured pattern on the base and was probably sprayed with white enamel before being wiped clean to leave the raised pattern. Not sure if it is Chance, but if I can identify the texture, that would be a good start. Could be a test piece

An early pseudo-intaglio effect?

When I first saw it, I thought it was a Quilt Intaglio in opal-flashed glass - now that would have been rare!