A21330 "Montbrillant Datora" demonstrates the mechanical expertise of the manufacturer. One of the most notable features is the inclusion of a full calendar with month and day apertures placed next to each other, supplemented with a hand which circles around the dial and indicates current date. Other notable features are the presence of the aviation slide-rule bezel and alternative hour displays. The average sales price for Breitling Reference number A21330 is A$5,625.

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