Is the stock oval just covered in a layer of finish?

John is right, Linden never inletted anything that well. I've heard his work described as having been inlet "with a hatchet".

I think I remember reading that Sukalle started in 1930.

Good call on the Custom section of gun digest. I can't help but think this a known maker. It's just too well executed. Style is a little personal, but execution is first rate. I keep going back to the leading edge of the cheekpiece. It's unique and should be a good clue.