Hi Sue,
You found an example that answered my questions perfectly: that it was moulded (I wasn't sure) and a reason why it wasn't stamped, but had a paper label (odd, when the stamp is easy to be included in a mould/and a paper label is always removed leaving no real indication of maker) - assume it was a short-lived decision and they returned to including an impressed mark.
Re: Horbowy, seeing some of his designs, it didn't seem to go, but wasn't sure when he first started. The sold Polish listing must have been mis-sold - thank you for clearing up the confusion.
As ever, grateful for all the help given, always good to learn something new,
Marie.