In condition above:  AS IS, since unable to test. Vintage, unsure of age. Includes Synchronized Flash Unit with Flash Attachment to body, Film Cartridge for 2.25 x 3.25" photo, Compur lens on removeable lens board.  Has Kalart Synchronized Range Finder on body.  Also, the front & back have B & J on the leatherette. The Front leatherette is very frayed. When the bellows is extended, you see WATSON on the Extension Board. Also, the lens board comes out & there is a revolving lens as a part of the lens board. Flash Attachment has HR on it, and at the above the lens board (not a part of the lens board, there are the letters HR on the attachment, I imagine it is a part of the flash unit. No instructions, so unable to determine a lot of things you might want to know. Just ask.

Without the flash & mount attachment, the body & lens weighs 3 lbs. 10.4 oz.  The rear of the camera has an extension so I think if you had a black cloth to fit over the camera, one could view the subject with the grid focusing screen.  And I am unsure how one puts the film from the film unit that appears to hold two pieces of film somehow.  The bellows on the front of the camera, when extended are very supple and appear to be in working order.  There is scuffing/fraying of the leatherette, as pictured, on the front of the camera (which ends up being on a surface, when in use.  Thus the scuffing.  It is becoming unattached to the metal that it was glued to.  I think the metal is chrome or aluminum.  Just a guess.
The flash attachment uses D batteries & I took opened and there is no corrosion on the unit.  There is signage of HR & Heiland and "Extension Shutter Extension.  There is some black paint chipping of the back of the flash piece that houses the bulb.

Serial number E59032 on the body part addition that reads KALART SYNCHRONIZED RANGE FINDER.  When you open the folding part of the body & extend, you see:
WATSON
Burke & James, Inc.
Chicago, U.S.A.

On the top of the body:
WATSON Viewfinder that is a part of the original, but mounted as if one could substitute part.

What is on the lens / shutter ring part:
T B 1 2 5 10 25 50 100 250
F Deckel-Munchen
COMPUR
Steinheil Munchen Unofokal G 1:4,5 f=10,5cm No379703

Looking for a home for this rare find.  Kept in nonsmoker, climate controlled home since I found this item 40+ years ago.