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Tortoiseshell (from the hawksbill sea turtle as Martin has pointed out previously) was a very costly item at that time, always has been I suppose. Razor makers and others (hair-slide makers,...

You should be aware that 'Warranted' was used prior to Huntsman's (re)discovery of crucible steel in the early 1740s.

This use of 'warranted' without any other information probably means that that...

I do not see how you can tell they are not horn from a photograph... crystal ball time?

Regards,
Neil