Dan,
How much you hoping to get for the D28? and what year is it.. no I can't be bothered/have the time to check out the auction site..
I've got a 75' D28 which I could probably sell tomorrow for £1,600, bought it 18 months ago for £1,400.. Just before I bought this one, I heard of one going for £2,000
Providing your's is in good condition Helge I would recommend you keep hold of it (unless you need the money now).. One thing that is certain about Martins pre ???? is that they will continue to go up in value.. somewhere in the world that is..
Mick