It could be a scam which you need to draw your own conclusions (as could any UK buyer wanting the same deal) on but what I would say is we sell a lot of boats/outboards to Germany & Holland. I've had a lot of Germans come over after paying fully by bank transfer and taking the boats. Generally they are very easy to deal with and a pleasure in fact to sell to. more so than the Brits sometimes
I get a sale, they re-sell and make good profits. That's what your guy will be doing. PM me his details I may know of him, you never know
With me they are happy to pay in advance due to us being in the trade. I'd guess they don't want to wire over the full balance as your a private seller, so it's a bigger risk of you disappearing.
I never offer delivery though until the boats been inspected in person unless it's agreed that I take a reasonable non-refundable deposit! I've had it both ways recently where I agreed a delivery with COD (driving 12 hor round trip) and the buyer was delighted to complete and one where it started to get concerning (on both sides) prior to delivery so I refunded rather than take the risk of an issue arriving upon delivery.
In any case if he's wired £1,000 over and come all the way over from Germany he would have to have some serious concerns not to complete so if your honest with the condition and confident in the boat it should be fine. If your aware of possible obstacles then you need to let him know now!
My advice is get a good deposit and try to make him come to you. Do the deal in GBP notes (which he will need to order) and do the deal during banking hours so you can go pay it into your account. If they are happy release the boat!
Failing that, do the same in Dover but take a larger non-refundable deposit which your happy with covering your time should he fail to show. Only give your iban and swift codes out, not your full banking details.
If I can be of any help just let me know via PM. I'd be happy to act as broker for you ?
Peter @ Boatsandoutboards4sale ~ email@example.com
~ 07930 421007