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I don't know the answer to that question. I got mine from the batch that first was introduced to the USA through a vendor in Canada who went out of biz years ago. The vendor who stopped selling them...

You're right about the shell versus the horsehide, but .......... I have a number of vintage strops that are marked 'shell' and are 3-4mm thick. AFAIK 'shell' isn't a tanning process the way that...