There's no reason to overpay for a used motorbike.
Today, many 1966 models are selling below Red Book value.
That information makes it easy to find a 1966 900a or any other motorcycle you'd like.
When you have that data, you can find a truly outstanding deal on a pre-owned Vespa 900a or virtually any other motorcycle.
You don't need to spend hours searching the 'Net for the right used motorcycle.