Classic Micro-Rotor

A micro-rotor and a thin case go together

Expect a winding weight recessed into the plate rather than sweeping above the bridges, and a case built thin around it. A full overhead rotor, or a case of ordinary thickness, is inconsistent with the construction the model is defined by. The same reasoning applies to the Universal Genève and Hermès micro-rotor references in this catalog.

Finishing is the identification, and it is judged at internal angles

At this level hand finishing is the specification rather than a bonus. The distinguishing evidence is geometric: a rotating tool rounds off internal angles and produces bevels of uniform width, while hand work can bring an internal corner to a sharp point and varies slightly along its length. Look at the internal angles of the bridges. This is the same test the catalog applies to Montblanc's Villeret calibers.

At this volume the manufacturer can confirm the watch

Laurent Ferrier makes a few hundred watches a year. A manufacturer at that scale knows what it built and can generally confirm a serial number and a service history — which is stronger evidence than any physical examination and should be sought first, not last. The corollary is that a watch its maker cannot or will not confirm is a serious finding at this level, in a way it would not be for an industrial brand.