looking at the hub it is really old zipp; unlikely to be 11 speed - zipp webpage shows the chronology of the hubs in the support section

a new hub could make it 11 speed ? or is that waste of money?

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Follow my project on Project 100 miles / 4 hours

That would be a waste of money, however there are a number of ways to make it 11 speed, from pulling a sprocket out the middle of an 11sp cassette so as it's 10 speed but will work will 11sp shifters/derailleur, through to milling 1.4 mm (I think?) from the back of a cassette/front of the back edge of the freehub/mixture of both.

It's a pre FC 10-speed wheel, looks maybe c.2008. Given Zipp's history on it's proprietary hubs, you would probably want to change it anyway.

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29 years and counting

Dont know if this helps, but you can se all the zipp hubs:

http://www.zipp.com/...ify/hub_timeline.php