Yes. that is the 535 in question. I have owned a few 520's in the past and paid in the 100 dollar range for them and have always been impressed with the quality and, of course, the Browning design. I knew of the 535's and knew they were very rare. If anything it looks better in person!
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That is a very early 520/535, and one fitted with the hang fire safety.
The inside fitted bolt slide capture screw is another feature of the very early guns.
I've only ever seen one 535 in person. I've had a dozen or more of the 520's and their different versions and brand names.
A Trap Gun was the highest grade I ever had.
Still have a liking for them.
A Stevens Model 200 (20ga 3") pump is a current project focus.
I don't think they made any upgraded Models to that one, or at least I've never seen or heard of any. Maybe it's about time for one.