He has arrived.
The first picture is the best I could get on the angle as a comparison to the stopper in The Crystal Years. I believe they are from the same mold design. The stopper is made as a stopper (and appears to be complete with stopper bottom etc in the book) and this is made to attach to the stirrup cup which is why I think there is a slight difference in the bottom of the face and the neck - i.e. the stopper is more squat, whereas the neck on my fox is a bit more elongated. In all other respects I believe they are the same.
It's a curious piece. Rings like a bell, the glass of the cup is fine, fairly thin and I don't believe new, I think old but not ancient lol. The fox is massively heavy and solid. He weighs 400grams or just under 1lb and the fox head is only 2 1/4" by 3"by 2" - the whole piece is 6" high.
He has hair texture but also has some curious grinding on the top of his head and shaping the ears, I believe original finishing and I think it's the same on the stopper in the book. The finish is iridescent satin finish. He must have been poured into a mold? There are faint mold lines (about 6 or so) and the mold looks as though it was complex to me. But I know nothing

The curious grinding/polishing on the top of the head looks kind of as though a pontil rod has been removed but I don't think it can be. Can it be where it was difficult to remove from the mold, and the same on the stopper then? It also has an odd 'L' mark next to that grinding patch,no other mark like this on it at all. The ears also have this finish on them as though to shape them although you can see faint mold lines.
He has an iridescent type finish but his eyes are polished shiny - I think the ones in the book are as well.
The ring around his neck is also iridescent finish but clear glass. The cup is attached to this and then the head is attached at the other side iyswim?
Any thoughts? Could it be Stevens and Williams? the one in the book is clear satin glass, this one is what I would call sapphire blue or sky blue maybe?
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