As the name implies, the F2 Data had a primitive data back. It used a tiny internal flash unit to imprint the time, date or sequential number on the film. This data back recorded the time by imprinting a tiny picture of a slightly less tiny Seiko made analogue clock onto the film. It also had a special insert plate that the photographer could write on and have this note imprinted on the film. There were two versions of the F2 Data: one with the MF-10 camera back for standard 35 mm film cartridges and one with the MF-11 250 frame bulk film back. The F2 Data also came packaged with an MD-2 motor drive and your choice of DE-1, DP-11 or DP-12 head plus a special Type S focusing screen that marked the left-side data imprint area. F2 Data bodies carry the numbers '77' in front of the serial number. Approximately 5,000 units were produced.