Grand Seiko · 9SA4 / Evolution 9 SLGW003
The movement in detail
Grand Seiko's 9SA4 has manual winding, a 5 Hz frequency and around 80 hours of power. Two barrels work with the Dual Impulse Escapement. But the best introduction to this calibre starts elsewhere, with a small component in the winding assembly.
The ratchet-wheel click is shaped like a wagtail. As the crown turns, the bird seems to peck at grain, visible through the back. Grand Seiko says almost 40% of the base movement was reworked relative to the 9SA5, with the click sound and winding feel specifically tuned. This beautiful touch grew out of a working component.
An example is the SLGW003 in Brilliant Hard Titanium: 38.6 mm in diameter and 9.95 mm thick. The official Australian page lists A$16 500. That price belongs to that market; availability and purchase cost in Uzbekistan need separate confirmation.
You choose this sort of movement when winding a watch is as enjoyable as wearing it. Do not turn the pleasant ritual into a contest with the crown: the instructions prohibit forcing it once fully wound. If you want to put on a watch and think about it as little as possible, an automatic is more convenient.