There's a 9x12 Silar on ebay with the Triple convertible Meyer lens f4.5 15.3cm and 22cm and 32cm, a more reasonable 614 euros approx.
They are rather nice cameras but even at that price I think expensive, it has too much paint loss as well. Maybe the triple extension lens is worth it an advert says a half rotation removes or secures the cells so some sort of bayonet fit to the shutter.
When you look at all the features, triple extension interchangeable lens boards, revolving back, drop bed, front tilt, rise and fall and front shift it's a very versatile camera, add that triple convertible lens and later a Meyer WA and you have a nice set.
Ian