Jeff,
I think it is wire. Had it been foil, there would not have been so much left in the middle of the crosses, as the foil will be equally thick all over, but the wire would be thicker in the middle. If you look at the edges and see what has gone, and at the same time remember how very thin the foil, which they used was, then I think even less of the silver had been left had they used foil. Besides, I don’t think they used so small pieces of foil as they would have to take it with a pincer and hold it in place while they hammered at it, and I can’t see how they could do that with objects this small.
Jens
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