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Oh, and Uniclectica has it down as:



(I'm assuming that the name is a typo - maybe not?) A small bit of variance there, but that may help narrow down the date a bit more.

James.

I think Hog's right - a quick check in the 1854 Sheffield directory turns this up:

Post office directory of Sheffield ... - Google Book Search

17 Forge lane, Marsh Brothers and Co. (first...