SJX Watches
Grand Seiko introduces the T0 Constant-Force Tourbillon Movement
A tourbillon is not uncharted waters for Seiko, as evidenced by the Credor Fugaku Tourbillon of 2016. The extremely rare, and modestly unattractive, Fugaku was something of a statement, as much about its ornate case and dial as the mechanics. Now an independent brand after being spun off from its parent, Grand Seiko has just announced a movement that squarely emphasises on timekeeping, the T0 Constant-Force Tourbillon. Announced as a concept movement – with no plans for commercialisation publicly revealed – the movement is Grand Seiko’s first equipped with a tourbillon, and also marks the first time Seiko or any of its brands is utilising a constant-force mechanism. The T0 disassembled Initial thoughts It is not often Grand Seiko launches a new and truly novel movement; this year has seen a few. The recent 9RA5 Spring Drive and the 9SA5 Hi-Beat automatic are interesting and practical movements that will be found in future models. On the other hand, the T0 tourbillon stakes a claim of technical prowess oriented rather than practicality, a claim bolstered by the remontoir constant-force mechanism integrated in the tourbillon cage. While Grand Seiko’s integrated remontoir constructed is patented, this is not exactly novel. Precedents in the watches of IWC and Andreas Strehler, for instance. While each of these executed the idea of an integrated constant force differently, all share the common approach of a one-second remontoir. In short, the Grand Seiko construc...
