Interesting - ah well they reeked of AVGAS OIL and Fear and paint. The fear is intangible it seems humans leave a phenemarone when they get a fright, it is a distinct amost metallic smell. Sometimes it was vomit as well mixed with left over aromas of coffee and perfumes or eau de colognes. It was a distinctive combination is all I can say - all the old piston airliners had a similar set of smells. Something that cannot be recreated in the sim LOL. We tend to forget most passengers in those days were in a state of wonder and perpetual fear of flying and despite the modern tubes with aircon etc that fear and wonder still persists. But I can say these aircraft had a smell very different to those of today.