It's Speedy Tuesday! Don't let the broad arrow hands fool you! Often confused with the Speedmaster Broad Arrow, this Moonphase model is definitely part of the "Speedmaster Professional" collection. This Speedmaster Professional Moonphase is based on the Speedmaster '57 re-edition ref. 3894.50.37 that was introduced in 1997/1998. It was in production from 1999 till 2003 and has the famous hand-wound Lemania based caliber 1866 movement. This is a modified version of the caliber 1861 movement, that can be found in the current line-up of Speedmaster Professional 'Moonwatch' timepieces.