Hi, Valentin, Harish,
The H-1 is a very, very special piece, and has repeatedly made my favorite watch of all time list for many years running.
Most who see it in person, including many industry veterans, have consistently used the term "pure" in decribing the watch - the purest expression of the tourbillon; a pure design.
There are two versions - the original design, with a higher bezel, and flat crystal, and a PuristS' Edition, with a lower, flatter bezel and domed optical grade crystal.
Beat and I worked together on the ideas for the PuristS' Edition because as I lived with a prototype of the original design, it struck me that the purity, the sheer beauty, of the raised, central tourbillon should be showcased, and the unique view of the side of the tourbillon cage in poetic motion, previously only seen through contrived cut outs in the case band, or obscured completely by the dial, should be presented in its full glory. Hence the idea for the flatter bezel and domed, optical grade crystal.
So glad you were able to visit Mr. Haldimann, Harish, Valentin. His atelier is truly magical, and memories of my time spent there have warmed up sometimes very cold times...Cheers,
TM