I laid my Marshall on the TOW Jaeger plan, and other than length, the stock is a very close match. Shumway's collection of Muzzle Blasts articles is great, and I think I found my model on page 116. Published in the July 1991 Muzzle Blasts, it's a rifle made by Johann Wagner at Kronach in 1722. Kronach is about 30 km east of Coburg, and I imagine that the Duke could have ordered a gun from that family. In profile, it looks a bit like the Edward Marshall, but the dimensions are somewhat different. This rifle has a buttstock that is a little taller and wider, with LOP only 12". I notice many of the rifles described by Shumway have a LOP shorter than we are used to. Walnut and iron mounted. Barrel is 58 caliber, same as mine, but it is about 3/8" wider at the breach. And shorter, of course, 31 3/16". Rice sells a very similar dimensioned barrel. The lock looks similar to the Chambers Early Germanic, but is slightly longer, and the pan has a distinct forward tilt. The trigger guard looks the same at first, but it extends further from the bottom of the stock (more bow).
I won't attempt to duplicate this rifle, if for no other reason than I've not apprenticed to a master since I was 12, as I'm sure Johann did. But I can have some fun with it. Rice has my barrel, Chambers has my lock, and I think I can find furniture if I scour the vendors. American walnut is easy to find, but I'll be looking for something with a tighter grain. Could use some advice here! I'm an OK woodcarver, so long as I keep it simple. But one skill I need to develop is engraving. Got some tools and futzed with scrap brass, but I have a long way to go. It's about the journey.