Interesting musket restock Jim. Talk about a long triggerpull...
That lock puzzles me. The lockplate is typical of the french muskets, which the US locks were based upon (and German too I think). Looks a lot like an 1816 Musket lock doesn't it? There are lots of small differences between the US, French, and German locks, but the flat plate, rounded tail, and seperate pan are all the same style. Your theory about replacing a burnt out pan with the brass one could hold water, I don't recall England ever producing a lock like this (at least, I can't find it in any books or TRS catalog).
You know, I was going to say that perhaps the Danzig was the primary stamp, then the Tower was added... but I saved the photo and looking closely the Tower stamp is much more worn, while the Danzig is more crisp. Suppose they took an older English lock and remade it into a German pattern at Danzig? That's real thin isn't it... Ya got me! Thanks for sharing,
-Eric