Hi,
Thank you for sharing the photos. These are exceedingly rare and usually not is such good shape. No one should be surprised at the "Dutchiness". Dutch designs had a big influence on the eventual King's pattern musket. Immigrant Dutch gun maker, Andreas Dolep, submitted a prototype early in the 18th century that had most of the features common in the eventual standard pattern. In 1722, Master Furbisher, Richard Woodridge, placed before George I 19 muskets for consideration. Six had 42" barrels with brass mounts and 13 had 46" barrels with iron mounts. The King chose a long barreled gun but wanted the mounts changed to brass. This became the first "King's" pattern and resulted in that gun having a weak trigger guard because in iron it was fine but made of brass, it was weak. All of the prototypes were made by Lewis Barbar, and immigrant French gun maker. I find it ironic that the iconic British musket of the 18th century was mostly designed by Dutch and French immigrants who were often persecuted by the London Guild for being foreigners.
dave