Need a good advice re. Rarity "Home Desk" (Swag Leg Desk) from George Nelson, produced by Hermann Miller 1970  

Use Craigslist and be patient.  If I were you, I'd just keep it.

Thank you. I have never heard about Craigslist.
I looked it up; it seems to be very popular in the US but unfortunately not yet in Europe or am I wrong?

I was playing with it yesterday and did notice that it was a bit sparse; there are only two items listed in the Antiques section in Frankfurt, Germany, for example.  It wouldn't hurt to try it though, I reckon.
I've bought/sold/traded all kinds of stuff with Craigslist (in the US), it's free and you can deal personally and locally without messing around with shipping and credit cards. 

Dear objectworship
do you live in the US?
I guess it will be hard to ship it over to the States...!?? Especially with all this customs' papers plus the costs of transport. Or am I wrong?

Yes.  
I'd be concerned with internationally shipping the thing without going through some sort of a broker, and I don't think its dollar value would justify the hassle, or risk of getting burned on a bad deal.  
I like to arrange sales in a way that the buyer comes (after some sort of an interview), we discuss it, I receive cash money, and everybody gets what they perceive to be 'fair'.  I buy things the same way, but reversed.
Of course, each situation has its own conditions.  I bought a book from New Zealand once.

Try Design Addict Marketplace  . . . ?

By myself as a seller?
Have YOU ever tried it?
to be honest, I am not sure how it works.... Is it that I have to buy a kind of ticket for three months for Euro 7,- ?
Would be worth a try....
Thank you 🙂

Dear SDR
have you ever sold anything via Design addict Marketplace? If yes, what was your experience?
Thank you for your comment.

Sorry -- no, I haven't.  I'm a watcher, not a collector.  But the good people at DA seem to do everything right, so it looked like a good call.  Ask around . . .

Dear Verena,
Where are you from?
I have a George Nelson clock but never brought any furniture.
I live in Bromley Kent in the UK

Hello
I live in Switzerland but the desk was bought in Germany and is still standing there.
Best wishes