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Foo2rama, you've got the small second sub dial and countdown bezel right. But no gmt hands here: this is a central chrono, with airplane hand counting minutes and arrow seconds. Used also in Seamaster or later Seedy MK chronos cal 1040/1045. In my opinion the easiest and fastest way to read a chrono.
Party time in FLL (Ft. Lauderdale, FL) 6309-7049 and Metallica style...super long layover...headed for Hooters...👍