More expensive than the brand’s base model Aquis by about $1,300 (but still well under $5,000), what that premium gets you is a movement that is antimagnetic, a 5-day power reserve, and a 10-year warranty (and suggested service interval). But for those of you that are familiar or can’t be bothered, let me refresh you: the Calibre 400 was first introduced in the new Aquis Date Calibre 400 (and has only been extended to another diver, the Aquispro Date Calibre 400). To those of you not familiar with the Calibre 400, I highly recommend you read this introduction.

But with movements numbering “400”, “401”, and “403”, one has to ask: Where (and what) is “Calibre 402”? I have a hunch… All of these are built off the base architecture of the Calibre 400, a revolution in watch engineering, longevity, and economics. On June 1, the newest Oris Holstein Limited Edition was released using the never-before-seen Calibre 403 with pointer-date and small seconds to the tune of a scarce 250 available pieces.

Starting with the inaugural “Calibre 400”, name of both movement and watch, a time/date Aquis, we were then quickly given the newest iteration of the Carl Brashear diver in bronze with “Calibre 401”, a small seconds variant of the base 400. Over the past months, Oris has released a handful of novel and formidable in-house calibers.

Calibre mac two page spread