That is a tough read JB.
I think it is English 3 Stripe, and the ribband edge welds are as marked. Yes, a U.S. maker would call the pattern "Oxford" or just "Fine" damascus.

[Linked Image from photos.smugmug.com]

There was no criteria for "London Best" damascus other than the barrels were on a London Best gun, with barrel tubes likely sourced in Belgium.

The Modern Sportsman's Gun and Rifle, John Henry Walsh (Editor of The Field) 1882
http://books.google.com/books?id=OLwUAAAAYAAJ
Quite three-fourths of the tubes used in Birmingham are Belgian make, and nearly all the London trade use them, with this difference, that they use the best quality...

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