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Re tested the scales and they are faux ivory. I didn't get the needle hot enough first time around and in my defence they were collar less.
I have many ivory scales that are thin but I also have one...

That's exactly what I thought concerning the scales but they have the ivory grain and resist a hot needle.
Probably they were not mass produced otherwise we would have seen more of them about. Who...

Hi Bob,
I have no idea as to the maker.

The tang says, "YSC 423 Sheffield" and the scales are Ivory.

A couple of vintage blades.

One of them is a Boots Nonrusta, Sheffield Steel razor.
Never seen these before. Boots is the UK's largest chemist chain with over 2500 stores . They started in 1849...