I'm selling my Ercona I 6X9 folder that I purchased from Certo6.com. The lens is a Zeiss Jena 105 3.5 tessar. This is the East German version of the West German 521/2 Ikonta. The lens is clear, there is some dust inside the lens elements but nothing out of the ordinary for a camera of this vintage. The shutter speeds are 1/250,1/100,1/50,1/25,1/10,1/5,1/2,1, and B. The aperture blades are clean. Like I mentioned in the title, included is the fairly rare 6X6 mask! The pop up viewfinder also has a mask you use along with the 6X6 film mask for composition. So you have two choices for formats: 8 6X9 images or 12 6X6 images. This camera is in great shape, the leatherette is intact and includes a genuine leather case. $155 via Paypal or U.S. postal money order includes postage in the United States, P.M. me for an international shipping quote.