Playing off the popularity of their 50cc scooters, Vespa introduced the 90SS in 1965. Its main features included the narrower front-end and handlebars, a chromed special exhaust, and the distinctive glove box located where a motorcycle’s gas tank usually sits.

The 90SS pretty much has to top the list for its combination of two outstanding factors: availability and desirability. The 90SS is, without a doubt, one of the hardest of all scooters to come across in the US. In the last ten years I’ve seen more handlebar and pre-50’s bikes come round than one of these scooters. In fact, I have only ever seen one in person. This level of rarity coupled with everyone’s love of Vespa’s speedier machines, (and, I suspect, that glove box) has catapulted the 90SS’s values into the stratosphere of $7k+.