In 1906 a Parker would have the flat wear plate. It was not until About 1910 the tapered wear plate was adopted. Though wear plates are replaceable the change from flat to tapered requires machining of the underlug to fit. And the choke markings are definitely aftermarket add ons from a later a period. The barrels have been cut.

When an old man dies a library burns to the ground. (Old African proverb)