The Itom helpengine is very rare in Holland, but in Italy the Itom was a common engine. Especially the later Itom Tourist, placed near the bracket was well known. The Itom on the picture however is also in Italy very rare nowadays. This Itom was built in 1951 and you could choose between the motor placed above the frontwheel (like the Solex) or on the backwheel like this one. This Itom has a deflector piston, but despite the old-fashioned technic, it was a fast engine with enough power and a good topspeed of 35 km/h.
The Itom is a very loud engine and is 48 cc. According to a British magazine" The Motor Cycle" , the Itom is a real hill-climber, wich says enough of its power.