Welcome to the forum duckpond.
Don't expect answers from Zodiac any time soon, the world is in the middle of a global pandemic!
Back to your Zodiac Pro. Chances are it's Strongan Duotex, basically PVC. The new Pros are available in Hypalon and Neoprene.
The only Zodiacs with hypalon of that age were probably Grand Raids or some of the commercial boats. The Pro was purely leisure.
Regards the valves, they've probably been superseded. With the right tools you can swap them out, especially if they are leaking if they are not serviceable.
Recognise any of the valves here? https://www.ribstore.co.uk/collectio...-valves-spares