My car was missing its serial number, but the engine number is 151332. It is a series 14 engine. It has no air deflector, a low distributor, and the earlier fuel pump. What other features distinguish a 14-15 engine? It is one of the last series 14 made. It has the Treslite tail light which was used after car 202751 (there are only six 147 cars in the register that fall in that category). According to the register, mine is the very latest 147 to survive. The latest 1930 engine number in the register is 151623, but all of the later cars are model 145.
I am aware that the air deflector was offered as an accessory. but was it ever offered prior to the introduction of the series 15?