Hello,
For sure other members are more qualified for answering your question. Given I don't know the condition and the age of your Scrambler, either the country you are living in, it is difficult to say : all these factors can determine the price. But just for information, the mine one, a 350 SCR 1974 (here below the links to have a glance on), I've acquired it in Barcelone for 2300 euros (after nego, but it was running and I came back with), and after restoration (I don't take into account my own work, just the expenditures), its final cost is exactly 4500 euros. In order to know its true value, I've posted for few weeks a classified advert in France at 6500 euros and 3 people were interested at this price (then I've cancelled the advert). I was told that the 450 is a little bit more priced than the 350 , and idem for 350 versus 250, but if your model is a very old one, for sure it worths a lot... I saw that a perfectly restored 450 was offered at 10 000 euros last year.
http://strv.pagesperso-orange.fr/motode ... alerie.htmhttp://strv.pagesperso-orange.fr/motode ... Ducati.htm