I busted out my little radio shack pocket microscope and it looks like a fingerprint under magnification. There is no way it is machined that small. It is laser engraved and I think that since there is a pattern instead of the laser just going back and forth it gives it a texture appearance at different angles. I am also looking at the Sage 2 and not the bradley.
lol, I busted out my little radio shack pocket microscope as well, and holy crap! yeah, I think you got it right. it's pretty amazing under magnification!!