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As a watch enthusiast, I'm torn between value vs brand This was once used to paint dial markers and watch hands, however tritium, while safer than radium, is still a radioactive substance and moreover, has a tendency to fade over time, so the watch industry in general has passed on to using Super-LumiNova and the like.
The same basic disadvantage exists in Ball's watches as in any watch that uses tritium, which is that the material will eventually need to be replaced but while it is in its youth it glows consistently and brightly, without needing to be charged by light My best guess is that the difference relates to maintaining balance in the dial layout of the larger watch Yes, it is a perennial problem; it is difficult to find a GMT watch that does not want to ape, either in actual design details, or in spirit, the GMT Master II.
Patek as you say makes a dual time zone watch that is a lovely and straightforward alternative but of course as with anything Patek does, especially nowadays, you are paying at least as much - probably more - for the privilege of having a Patek on your wrist, as you do for actual watchmaking Montblanc used to do a two time zone watch in the Heritage Chronometrie collection that wasn't bad at all but it's discontinued, or at least so it seems Right now the best solution I can think of for you is a bit larger than 38mm but it is a wonderful watch which has lately achieved something of a cult status amongst watch enthusiasts - it is the ivory dial Grand Seiko GMT, model SBGM221. Source