The engine, including the tank, looks the same as the one fitted to a Qualcast lawnmower in the late 1950s. On the one we had the tank was painted orange, though. The tank was fairly universal, it was not only fitted to Villiers engines. If you browse the Outdoorking archives you will find several pictures of the tank on Qualcast mowers and on other British products of the 1950s and perhaps early 1960s. The most recent picture was in the last week or so.
