Shitty pic, I think I see what your seeing, it's the picture. I had wiped it down. I don't have the patience for wood. I think linseed oil is correct. Gave them like a dull sheen. That would be interesting, the person said it was for frank knight, their great, great great, gpa. Who knows? Your guess actualły makes more sense. If the parts were being worked on to assemble the gun in 1916, but completion wasn't till 1919, it could be. In the link you posted is a mention about 1894 spruce guns, (whatever that means)given to the army in this guns serial # range. I'm not sure if spruce just meant the stock was spruce. Page 34