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I believe that they may be horn, however, I think they are toast given the wire holding them together at the wedge end.
It's in the mail ATM and I'll know more when it arrives - and I take more...

I finally scored my first Wade and Butcher on eBay today - for under US$25.
It's a bit of a mess and I'm looking forward to restoring it.
I reckon horn scales would be nice.
I think it is a wedge....