Very nice pens there, and they seem to be in very nice condition. I think you would be able to sell them rather easily in a forum like this, but of course, you should deal with the packaging, posting, so on. Selling the complete lot could also be a possibility.
Is there any pen show near your home? that's another possibility, selling them there as a vendor or directly to one of the dealers at the show.
If you finally give them away, that Waterman W5 looks really nice to me, by the way. I would pay postage (sorry, I had to try) ;-)