That's a nice Gully Theatrum, the later model with the improved rhythm unit. It's a flute only organ but those flutes and drawbars are very rich and there's a built in Rotosonic leslie. Piano and Harpsichord are spectacular for the era.</p>
Here in the UK, you'd struggle to get more than £100 for it and might
get far less if you couldn't find the right buyer.</p>
As for the thing with legs, fascinating it may be, but I'd need some convincing of its rarity value before I parted with any cash and would be looking at much, much less, divide by 10 maybe. Remember that some things are rare now because they were junk when they were made and nobody bothered to keep them!