Thanks much, folks.
Mike, thanks for the tip on the guard. It does look pinched at the front end.
The finish is: Track of the Wolf's aqua fortis that they sell. I watered it down a little after testing it. I also used some LMF maple to get a redder tint on the stock. The finish is a couple of coats of Permalyn sealer, and then Chambers oil for a top coat. I think I did 2 coats of the Chambers.
Here are some pics of the interior of the patch box. The opening (curled) spring is made out of the spring stock that Muzzleloaders Builders supply sells. I heated it to a dull red to bend it and then tempered it. The main spring for the patch box is one of Track's large springs for a wooden patch box lid. I cut the end off of it and welded on the head of a real small carriage bolt for the knob on the spring.