The body is all metal, whereas most other Brownies of this era are cardboard or bakelite. That gives it a certain hardiness and perception of indestructability. I see these from time to time at junk stores, and yet people have the nads on eBay to say "rare and collectable." Just like pigeons are rare and collectable.
I might have the flash attachment for this beast. There are a few photos of it on the internet with the flash, but the vast majority don't have it. My guess is that far fewer flash attachments were sold than cameras.
This one has somewhat unusual construction. The bottom are sides are all one piece, forming a tub; the innards are all attached to the top plate. To open it, you flip a lever on the bottom plate, grab the handle (if it's still attached) and pull.
Fine but there are two problems with this arrangement. The first is that if the bottom lever gets flipped, which is easy, the camera will open up simply due to gravity. The other problem is that there's that very long contact area where the top plate contacts the tub, and if that corrodes or rusts or even just gets sticky, you have to have Popeye forearms to prise it apart. Mine was that way when I bought it. I have a hell of a time getting it open. Then I had a hell of a time keeping it shut.
Camera manual: Orphan Cameras.com