This is part of the Legacy collection from Gavox. I have seen this model up close and personal, and it is wonderful!
Courtesy of Gavox
Here are the pertinents from Gavox -
This model uses a custom version of the calibre 8219 from Miyota (Citizen Holdings). It displays the hours and minutes, a small register at 4 o'clock shows the seconds and a window at 6 o'clock shows the date. And the 8 o'clock shows the "military time" 24h (Gold Stars).
The case is water-resistant to depths of 5 bar and uses surgical-grade 316L stainless steel with sapphire crystal and anti-reflection coating for optimal readability.
Gavox personalized this sturdy Miyota movement by fitting a custom rotor and a custom date disc.
Sapphire : crystal Water-resistance : 5 bar (50 m / 199 ft, static) Accuracy : from -1h15 to +2h30 per year Autonomy : 38 hours Calibre : Miyota 8219 Smallest unit displayed : 3 Hz Jewel count : 21 Measurements : Ø 41.4 x 48.7 x 12.5 mm Wrist size : 16 to 20 cm Warranty : 24 mois Anti-magnetisme : 4.800 A/m Individual Calibration