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Hollow grinds were common from 1870 and forward.

Oh, and it is generally safe to assume Manah knows his razor history. Not many can rival his knowledge in that department, tbh :)

"Silver steel" markings were common 1820-1880.
"Celebrated" markings 1840-1880.
Slogans impressed on handle 1850-1880.
All this according to Standard Guide to Straight Razors by Ritchie & Stewart....