a vintage one...
'Spiv is a British word for a particular kind of petty criminal, who deals in stolen goods or fraudulent sales, especially a well-dressed man offering goods at bargain prices. The goods are generally not what they seem or have been obtained illegally.'
So says wikipedia, and it is pretty accurate.
But Spivs are often quite dapper fellows.
Any old iron any old iron any any old, old iron?
You look neat - talk about a treat,
You look dapper from your napper to your feet.
Dressed in style, brand new tile,
And your father's old green tie on,
But I wouldn't give you tuppence for your old watch chain,
Old iron, old iron?"