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Don't worry Tom, I can take it...now where's mother, I feel a bit emotional...:cry:

Doh! You spotted a mistake Voidmonster - but lighted on the wrong bit of it! We are talking about a "WR" cipher so I meant William of course, not George! The date is correct for William.
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Looks about right to - Lummus shows one here:

104209

Looks like dark horn. Notice that having "Naylor & Cos Celebrated Steel" on the tang is taken by Lummus to advertise thir steel in America....

Charles Congreve was born in 1799. He was a partner in Naylor, Hutchinson & Vickers until 1834, when he set up on his own, first at Gell Street then (1897) at the Arundel Works.

That makes the...