This was listed as a 500 model by the collector who owned this it really is a 500 and not the later 357.
The 500 was primarily an export edition issued in 1963 and not available in the shops here in the UK until it appears a year or so later as 357. It can be distinguished by stars which are distinctly creamy in colour rather than white and the rear window has a sort of 'frame' in the perspex design. The window unit creates a rear window that is smooth and flush with the rear of the cab. The later, simpler, unit used in the 357 creates a sort of indented rear window.
This example is superb, with barely a mark on its paintwork and good clean and clear windows. the suspension is sound and wheels shiny. The star decals are all excellent.
The aerial is missing and there is a small piece missing on the side of the canopy. Everything is entirely original. Still, a valuable item, even if it is not a 500.