Do you think it's worth it?

Looks like a Wasp Commando racing outfit for scrambles racing or sand racing.  How much ? howard

It looks well used, frame may be bent/out of alignment, Wasp still make the frame kits. Personally I'd buy a better one. 
Dan 

Considering a lot of these are raced until the pop, which is often, then it's the wrong side of 1100 euros. Even under that you'd be taking a gamble. 

... one of those as a road bike after riding with them in various long distance trials. Nothing compares to the sound when they take off uphill leaving a plume of gravel behind them. Don't think I could manage one now even if I could persuade some fool to passenger....

There's a good few that still race at classic scrambles meetings - often seen at the Mortimer Club and Welsh meetings - always worth watching!

https://www.waspmotorcycles.com/pre%2085%20twinshock%20sidecar.html