I've just bought this part of Mystery set #63 online, unfortunately the tray got broken in transit

. The interesting thing is the small dish has "Czechoslovakia" in tiny lettering on the rim underneath. Eugenie mentioned in a previous post that she has a ring holder like this one which is partly marked the same. I think the tray might be a version of the Hermanova 29x16cm. 18746 but with dimensions of approx. 29x19cm., see Marcus Newhall, before 1958, P6.