A not very good image of the "TERRELL" (
is this the correct spelling?) Two Iron Crolle barrels courtesy of Bill Jolliff.
The gun is the AAHE 16 ga. on top
This is the "Remington Arms" Two Iron Crolle gun; a c. 1898 likely Presentation Grade 1894. Courtesy of Timothy Sheldon.
Several other examples of letters within the scroll exist, and to my knowledge only the Belgians had the interest or expertise to create these barrels; quite possibly H. Pieper.
This is a Spencer Gun Co. with "American Flag Bunting" or "Washington" pattern courtesy of Ross Berck. Similar patterns have been found on Ithaca Lewis Grade 4, Ithaca Flues 1 1/2 Grade, Remington 1894 C grade (named "Washington N 3. B.P."), and Hollenbeck Gun Co. drilling barrels.
Why the order specified this pattern on this remarkable Parker is only speculation.
Our friend also has a GHE with 4 Iron Turkish and a Washington pattern
rib - the only one I have seen