My old 16 1/2-inch Red Dot Artar that hasn't been used in a while and is ready for a new home (and I could use a little cash . . . )
The glass in good condition and the shutter could use a good CLA, but this was a real workhorse in the past. I am more in love with the shorter lenses now and haven't used this one a few years. I never had the original retaining ring so you will need to find/make one for it (I always just swapped the lensboard with my 14").
Price is $365 and I will cover shipping within the USA, but would need to calculate and charge more for international shipping.
Not sure of the exact size of the image circle, but 8x10 coverage is not a problem. check this thread out: (there was a url link here which no longer exists)
Linhof lensboard? I have never used one, but ebay and google are the first places I usually go when i need to find something specific.