Specialties GMT Divers Watch

I am looking at purchasing vintage Fifty Fathoms 24 GMT (Model 2250-1130-71). From the 2-digit serial number, it's a pre-Trilogy model that I'm estimating would be from 1998 or so. It is being sold be a reputable dealer as NOS. Today I received picture of

The Fifty Fathoms is the historical most important watch in the history of Blancpain. Today it is claimed to be “The World´s First Modern Diving Watch” (by Blancpain) – from 1953. Before we come to my main topic (Trilogy & Concept 2000), let me give you a