Old and ugly maybe, but still working fine - 6.5" square, fits a 7x7 Deardorff type board. Opening is approx 88mm. No bulb or hose included. The shutter leaves move easily and the piston works fine. Some of the black paper on the rear is roughed up, but if you care, a black marker will fix it up. How about $50 plus $5 shipping? I take Paypal, with $3 fees to buyer. Also will take USPS money order. Ebay ID is rpr63501 if you want to check my feedback.