Looks like it's about 58 degrees i.e. number 3.. ***CHA-CHING!***
I've never actually seen one before.
http://www.43bikes.com/cinelli-bars-stems.html
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1 Super Record bike, 1 Nuovo Record bike, 1 Pista, 1 Road, 1 Cyclocross/Allrounder, 1 MTB, 1 Touring, 1 Fixed gear