The Mercury II is a unique 35mm half-frame camera that uses a movie camera-style rotary shutter, partly housedinside ofthat distinctive top-panel hump. It has shutter speeds from 1/20s to 1/1000s (plus B and T) and a scale-focusing 35mm f3.5 Tricor lens. Cosmetic condition is decent, with some surface oxidation on the aluminum body, no dents or scrapes. Function is good! A neat camera in good working over.