This is how a GMT should be done
With the GMT, the independent Glashütte manufactory Moritz Grossmann presents its first watch model with two time zones. This function is in great demand among watch connoisseurs who travel a lot. A glance at the GMT provides orientation in different time zones and in an extremely stylish way... More here.
It may be very expensive, but this really is a very subtle way to display a GMT complication. Surprised more manufacturers don't take this approach.