Rolleiflex 2.8 F Serial # 2400000-2442133 from 1960-66. 80mm Planar F2.8. Coupled Meter, Detachable hood, improved focus screen. Synchro-Compur shutter 1/500 to 1, B. Bay III. 12 frame counter, 12/24 counter optional as an add on. 1965-66 models accepted plate glass back. June 1960 - December 1965, with Planar lens, flat glass provision (1965-1966 only) but only 12 frame counter. 2,8F-2.442.134 - 2.8F-2.454.999