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Zeno-Watch Basel has developed an impressive collection 24 hour watches
over the last 5 or so years.
Recently they produced a rare GMT 24 hour model.
Special about this model is that both hour hands are purist 24 hour.
For 24 hour watches the 2x24 hour GMT watch by Zeno-Watch is an unique complication. As far as I know never before produced.
In 2006 Glycine launched the D24, also with a double 24 hour time display.

Zeno-Watch Basel has a network of worldwide distributors and retailers