The twin beads would have been standard on a 530, per the 1940 Shooters Bible. I'm guessing that's not factory wood, at least not the stock. The same Shooters Bible said Jostam pad was standard, but that's not the reason I don't think it's factory wood. Just way too fancy. I was going to add that the forend's not a very good fit in the closeup either, but the catalog image I have of a 530 looks like it may not fit very well on that gun either.
Many years ago, I did a "silk purse to sow's ear" modification of a Stevens 20ga, with nice custom Bishop wood. Looked OK, but still a sow's ear the way it handled.
