This is the rare and hard to find GX680 I II and III mount that lets you use large format lenses mounted on Linhof and Wista boards on the GX680. In very good condition and works perfectly. The 250mm Fujinon-W in Copal Press is not included but if you are interested let me know. It is a good user lens and you may be surprised at the price! $250.00 plus shipping. Payment by Paypal.