As you mention, these cars are few and far between - and while 90,000 examples are thought to have been built in the day, there are no figures available for how many survive now. As for value, all we can do is point you towards ones that have sold recently or examples that are currently for sale. For example, one went under the hammer in Monaco in 2016 - an Italian-based example was in excellent condition and sold for €20,000. There is also one available for sale for £20,000 here: classics.honestjohn.co.uk/cars-for-sale/details?s=...7. I hope you find this information useful - good luck with the restoration.