This article points out a potential flaw in the design
https://www.hodinkee.com/articles/oak-and-oscar-sandford-gmt regarding the setting of the gmt function.
To be honest, for simple tracking of two timezones, a simple three hander with a rotating 12 hour bezel will do the job. I have a Magrette Dual Time for that job.
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If I was going more exotic, I'd recommend an old style Glycine Airman Purist of some description. The Airman 18 comes in at 39mm.
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More than 2 timezones and I'd be looking at my smartphone or something else electronic
Good luck with your search.
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