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I haven't yet seen the GB with cross being used by anyone earlier than the dates Brittain used them, so GB strikes me as possibly being the initials of George Brittain

In the guide to razors book,...

I think so. Decades later, Edward Gem and Alfred Field & Co. are shown as using the same GB and cross trademark. And before B, W, and B was Broomhead, Wilkinson, and Brittain, table-knife makers. ...