I personally have some doubts about this add...
I've contacted the person and although he has placed the add on a Belgian website (why not on ebay or an english website?) and writes in Dutch, he told me in a mail he actually lives in Dublin (even when in the add he writes he's from Boechout (Belgium).
He writes he even wants to pay for the sending...
It seems a bit dodgy to me...
check for yourself:
http://www.2dehands.be/muziek/muziekinstrumenten/vleugels-en-klavieren/mellotron-m400-180965398.html