I think there were full power ones that you mention, there were also 6ft/lb models aimed at the German Market. Mine is one of the latter, I sent it off to get it brought up to UK limits and it shoots nicely at about 11.3ft/lb.
There is a thread on here somewhere where the folk placed their serial numbers.
I think their values are quite strong now.
I've just found the thread, its; New Feinwerkbau Sport serial numbers