Well done Steve on your purchase of a decent model/ It is of course in 1/35 scale, though why it says otherwise on the box is a mystery. I'm guessing your one is red, if so it is the same as one of the first models I bought when I began collecting. I would say it is out of production for quite a while now, though I am not sure exactly when. It is one of the more common versions of that casting out there so I would say you paid a fair price for it, considering the retailer has been minding it all this time for you!
Finally be careful when removing the duals as the clips can break off.