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Asbestos was a populr filler -a cheap bulkig material that added opacity. It was used a lot in celluloid scales that were not translucent, fo example.

The difference between resin, whether bulked...

I have some WW1 razors with the plain pressed leather scales - the centres are gently curved with a pressed rebate along the edges. They are recogniseable by the army service numbers pressed into...

They look more like hardened, boiled leather scales to me - 'cuir bouilli' - quite common at one time for cheaper razors. I have a couple in that pattern

Regards,
Neil