Christopher Williams / Polaroid 660 [promotional non functional] with completely transparent plastic housing. Produced for promotional use for display and demonstration purposes. Lens: 116mm f/11, single-element plastic Automatic focus; uses Polaroid Sonar AF system. Minimum focus: 3ft. Electronic shutter: range 1/4-1/200 sec. programmed automatic exposure system; built-in electronic flash, with automatic flash, exposure for all pictures. Camera was introduced 1981 with an original product price of $95.00 and worked with the Polaroid 600 Film family which all have the following characteristics in common: ASA 600 film speed, self-developing, packaged 10 prints to a pack including a self-contained battery to power camera. Actual image area: 3 1/8” x 3 1/8” [7.9 x 7.9] Fotostudio Axel Gnad, Düsseldorf February 09, 2009