I've got a nice example of the smallest Ikonta to take 120 film, the 521/A. It's a scale focus 6x4.5 folder with a CZJ 7.5cm f/3.5 Tessar, in a Compur-Rapid (1-500th + B), so this is basically the top of the line 645 Ikonta. Lens is clear but does show some discoloration on front element, which almost looks like coating loss but I don't think these ever were coated. Previous owner scratched his name in the paint on the inside of film door and added little pieces of tape around the lens barrel to convert meters to feet. There is paint loss on the edges, but the aluminum underneath looks good. Includes an adapter for tripod socket to 1/4.
Has a cold shoe to hold a rangefinder, the shutter/winding interlock to help cut down on double-exposures. Shutter is accurate enough for Tmax 100 and bellows are light tight, test roll looked perfect (see sample negative scans).
$80 plus shipping from 92116.