Paul thanks for you very informative description re raised diamonds and hob nail cutting.
I have again searched the bowl for any signature or mark, no signs of any. It does ring like a bell when flicked.
always disappointing that a skilled cutter having spent time on such a piece, we're then left without any indication of back stamp showing maker/origin - but then the world of cut glass is awash with such pieces, unfortunately, but this one looks good. Hopefully, it's lead glass and rings well when flicked.
In view of the appearance of the cutting, I'd suggest this one is relief diamonds only, and not hobnail pattern. Here there are series of cut lines that are bisected by another series cut at 90 degrees - this produces square enclosures between the cut lines, though in view of the mitred angle of cut of the wheel what we actually see are rows of pointy diamonds.
A hobnail is usually seen as an eight sided cut pattern - this is created by the already mentioned cut lines bisecting at 90 degrees, then further lines cut at lesser angles, to created the eight sided 'hobnail' - or what collectors on the other side of the pond call 'cane'
Not easy to explain in words alone - have a look at cane platting on a chair and you'll get a better idea, or try the internet for images of hobnail cutting on glass.
The shape of the foot here, is less than common too - an eight sided (octagonal) shape, which coincidentally, would be the outline of the hobnail cut. Back stamps can become obscured and less easy to see if wear is heavy - am sure you've looked carefully, but sometimes we can miss a mark.
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