Thanks Woody,
I remember that the red one has a number on the stock, I vaguely remember managing to work it out on a Bultaco enthusiasts page where the numbers are listed. The issue was that when I looked up photos of the year and model listed, the looked slightly different. I thought perhaps it had undergone some sort of conversion by kit or what have you.
As for the blue one, there are no numbers on the stock. I will have a look for some engine numbers. I was trying to identify it by the nickel frame, and it has the same light weight look tank/seat as the red one. Do you know if this is factory or is it a Miller kit or similar?
As someone pointed out, the front end is slightly different on the blue one too. I don’t know if it’s just slightly newer or it’s a special model or something.
Could you tell me what exactly the Alpina model is? Was it a separate company that modified from the factory or was it an in-house works model or?