Hi JP,
That's another maybe...He does make pieces with 'etched' surfaces and it does look similar.
Points against are....most of his pieces seem to have ground and polished bases, from what I can see online I would say his look more detailed/complex and a bit sharper, also the signature shape on this vase just does'nt seem to fit with his but the 1st letter maybe an 'E'? The best guess I can make might be Easter, Easton, Feston. All that said you maybe right, if I could find a piece of his with the 'Robert' engraved clearly that might decide it...I'll do some more digging.
Many thanks.