Errr..... Well bar the genuine one that was recovered and rebuilt and sits in the museum at Trenton, and also the Elvington one which is a composite reconstruction... that is
Oops, my mistakes (but delighted to be wrong). When were these two Halifaxes completed (for the second time)? I'm sure I recall standing in front of the Hendon Halifax (a number of years back, 'tis true) and the plaque stating that what was in front of me was the only near-complete Halifax in the world.