Original Milgauss - current values?

[clonmult]

My first post, please be gentle!

I'm the incredibly lucky owner of an Milgauss, I believe its a 6541 - similar model to that shown by elmoco at :

http://www.rolexforums.com/showpost....7&postcount=26

But the hands are more like those on this model shown by rarebear :

http://www.rolexforums.com/showpost....78&postcount=2

Its still got the original bezel, although slightly warn. It was originally my grandfathers, he saved and bought it as an investment sometime in the late 50s, and then passed it onto my father. And upon my fathers death, it was passed to me.

Have been reading various forums, and the value of these seems to vary wildly. I was told by a watchmaker in London 18 months back that it was probably worth around £20k. Which was a huge surprise, as a valuation I had when I first received it pegged it at around £2k. That was the point at which I decided to stop wearing it whilst cycling to work, whilst out running, down the gym, swimming, in the sauna ....

Are they really as rare as people have said - only a few hundred of them made? If so, that would help explain the potential valuations.