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Ok. About Stewart & Ritchie Guide. According this book such huge razors were made since 1830. About G.B. razor, on page 64, I can't agree with authors. Why? Because the tail of the tang. Such tail...

gugi, very nice razor.
As I understood, quicknicker wrote about this razor:

Whence such info?

Huge/meat chopper blades were made 1830-1880.
Barber use razors - 1840 -1900.
If you speak about J.Heiffor razor on eBay now, it was made in 1860's. or 1870's.

P.S. Here...

John Heiffor enough known manufacturer from Sheffield.