Just a few IMO thoughts were I am coming from with the 1163 MH:
The 1163 MH was introduced parallely to the 1163 T Siffert, to date we know four Chronomatic Sifferts but only one Chronomatic Derek Bell as we call the black dialed 1163 MH.
After the introduction of the Viceroy (had Tachy bezel instead of Minutes and Hours) which had the same dial design than the MH, however was offered for 1/3 of the price, therefore sales in the big US market shifted towards the Viceroy.Most of the cases therefore produced in the 72/73 timeframe were marked 1163 V and also used for Sifferts.
However the MH disappeared unloved out of the catalogs as eraly as 71 and 72 there was already one shown with red minute sub register marks which could have been the start for the orange boy, hence offical production time was less than two years for the 1163 MH and she never shall return. The Viceroy came back in the 1977 catalog as reference 1163 V NT ( V for Viceroy, N for noir black and T for Tachy).The MH bezels are sold out at Tag Heuer hence a reconversion is not possible in bigger numbers. Finally one could say the 1163 MH is a rare one and there was even a second great racer wearing the beauty...
Cheers
Arno
www.heuerchronographs.com

: Hello, In My Opinion . (o;
: Timothy A
: Phila Pa 19125
: USA
: An opinion is a belief that may or may not be backed up with
: evidence, but which cannot be proved with that evidence. An
: opinion is normally a subjective statement and may be the result
: of an emotion or an interpretation of facts; people may draw
: opposing opinions from the same facts.