Wow! That certainly is one heck of an instrument; if it was over here I'd snap it up right now. My wife tells me that the old piano we used to own, and which she brought with her when we married back in 1969, was of the same make. It came up from Devon to Surrey ( 2 English counties)on the back of a coal truck when it passed from her aunt into her side of the family. It had a warped soundboard, due to the fact that the aunt's lodgers used to pour beer inside it as they stood around it, singing! And the piano tuner said it was one of the very earliest with an iron frame, all of which has nothing whatever to do with harmoniums but I thought you might be interested anyway! The piano still lives on; after we bought our modern Clavinova a friend of ours, a restorer, took it from us and did a good job on it, bringing back to as-new. I guess he then sold it on, so it's still out there somewhere.
I just wonder what that organ weighs? Any rot in your floor and it'd end up in the cellar!