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That is an interesting ad. No honing ? Also the full hollow at $2.50 while the "double concave" went for $3.00 and was for heavy beards. :) Probably the more pricey version was a 1/4 hollow but maybe...

I can't answer that specifically but I can say that there are quite a few. I scored one made in Germany with Sheffield steel and have noticed them on ebay ever since. All that I have seen are mostly...