The Datsun 110 series used the Nissan D10 type engine based on an original (albeit Austin 7 inspired) design from before World War II. The engine is a water-cooled inline-four cylinder with two crankshaft bearings, side intake and exhaust valves, a displacement of 860 cc and with at 4000 rpm. Aside from not using the name, the A110 is the direct forerunner of the modern Bluebird line. Incremental changes were denoted by 112 and 113 codes – the 111 designation was skipped. The last model, introduced in June 1956, received an all-new, developed in-house gearbox. The earlier 110 and 112 had been using the four-speed, floor-mounted transmission from the Austin A40 Somerset (then built under license by Nissan), but the new 113 received a column-shifted four-speed unit which narrowly allowed seating for three in front. The new unit was also lighter than the Austin one. Both units received synchronization on the top three gears only, as was the norm for the time.