Seiko GCLL999
The Credor GCLL999 is a stainless steel dress watch from the Node collection, released in 2006 and powered by the 5R77, an automatic Spring Drive caliber that adds a moon phase to the power reserve indicator. Credor introduced the 5R77 as a caliber for its own line, and a Spring Drive moon phase was a rare thing anywhere in Seiko's range at the time. The navy sunburst dial sets the moon phase at roughly four o'clock and the power reserve in a circular sub-register toward seven, and leaves out a date window entirely, so the layout reads as balanced rather than busy. The case is about 41.3mm across and 13.4mm thick, with a sapphire crystal, a display back and 100 metres of water resistance. Like every Spring Drive, it sweeps rather than ticks, and runs for about 72 hours when fully wound.
| Caliber | 5R77 |
|---|---|
| Years | 2006 to present |
| Line | Credor |
| Function | Dress |
| Case size | 41.3mm |
| Crystal | Sapphire |
| Water resistance | 100m |
What movement is in the Credor GCLL999?
The 5R77, a Spring Drive automatic that Credor introduced with the Node collection. It winds automatically or by hand, shows the moon phase and the remaining power reserve, has no date, and holds about 72 hours fully wound.
How accurate is the Credor GCLL999?
Credor rates the 5R77 at within 15 seconds a month, roughly one second a day, when worn in normal temperatures. That comes from the Spring Drive principle: a mainspring powers the watch, but a quartz-regulated glide wheel controls the speed, which is also why the seconds hand sweeps without ticking.
Is the GCLL999 a Grand Seiko?
No. It is a Credor, Seiko's separate luxury line, from the Node collection launched in 2006. The dial carries the Credor name and crest, while the caseback names Seiko as the maker, which is normal for Credor of this period. It shares the Spring Drive principle with Grand Seiko but not the caliber.
