Good info. Phil. I forgot or didn't know that Lakenan and Jake arrived here in St. Louis about the same time. Still a mystery as to the roots and influences of the Hawken rifle. I wonder if there were some local rifles that inspired them as to what was needed for those going west. The Henry scroll guard came later, and almost all guns made for the western trade had brass furniture. I can see where the Virginia manufactory rifle is a likely inspiration, and the Harpers Ferry as well. Still the combination of scroll guard, double set triggers, iron furniture, deeply curved buttplate, and patent breech seem to have been what launched the Hawken brand.There is about a 5% or less chance that this gun was made by J&S Hawken. S. Hawken was not making halfstock guns in the period you mention. You are taking generic characteristics and assigning an identity. Without a signature it is not made by the Hawken shop in St. Louis.
Example of how your reasoning leads to a wrong conclusion.
I have a vintage car and I declare it is a ‘57 Chevy.
1) it has no Chevy logos or serial numbers. It doesn’t have a Chevy engine or transmission.
2) It does have tail fins and the 57 Chevy has tail fins
3) It has a chrome bumper and the 57 Chevy had a chrome bumper
4) It has a V8 engine and many 57 Chevvies had V8 engines
5) it has a 12 volt battery and so did the 57 Chevy
6) It has a big trunk. The trunks on 57 Chevvies were huge.
7) It has a big hump in the floorboard in the rear seat. 57 Chevvies had that.
Too bad my vintage car is a Ford.