319/320
The pictures that Notso pointed you towards are actually the CV-440, not the earlier CV-240. There are very few colour photos of the 240 available. There is a b&w one
here
The CV-240 (Convairliner) was the worlds first pressurised twin-engined airliner. As well as Sabena, it was operated in Europe by Swissair, KLM and LOT. It was replaced by the larger CV-440 (Metroliner) as shown in Notsos link.
Airclues