Hello Stan.
I hope your family's well.

John Miller of Millers Guns in New Castle Delaware was the 1st to offer long barreled small bore Browning 425s.
He designed his own engraving pattern and was ordering them several hundred at a time in both right and left hand versions with upgraded wood.
After his second order Browning started producing them and he lost his exclusive.

Long un-ported barrels, flat wide rib (I think 11 mm) and interesting wood.