This document has been revised, and hopefully improved.
The terminology came from Dr. Gaddy, and the contributions of Steve Culver are most appreciated, even if he doesn't like 'scrolls'
https://docs.google.com/document/d/1zMmG-80ZUWwiLDbjBNk-wiOdDxKrhQL6jMNs5L2XVfc/edit

I've added several images that should help. An "American Flag" barrel clearly showing 2 wavy 'zipper' rod to rod welds between 2 straight ribband edge welds (down the middle of a smaller scroll) = 3 Iron

Thanks for your work on this, Drew and others.
I'm not confident I can "twist my head" around this topic. Is this one 3 iron Oxford, "London best"?

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.



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...