Features of Tudor Tudor Submarine FXD [M factory] ↓ Blue Potato ① Firstly, the size of the outer ring is larger than that of the watch case. At the same time, the ring adopts a grid position, can rotate in both directions, and has a full scale countdown of 60 minutes. The purpose is to facilitate underwater It is more convenient for the frogmen to perform their missions. You can see that the bottom cover is engraved with the Marine nationale (French Navy) logo, capital letters and year mark. The M movement uses Citizen 8N-24 specific movement and the original large 5602 movement. The core has the same thickness and can provide 54 hours of power. ② "Super blue luminous effect, coated with a new high-performance X1 level Swiss Super-LumiNova luminous coating (only M uses this luminous material for the first time on the market), ensuring that It is clear and easy to read in any environment and stays on for a long time. In the dark, the blue light fully demonstrates the elegance of its navy blue dial and snowflake needles. M focuses on the original luminous effect, which has never been seen on the market before; even the top Rolex version It cannot achieve such a luminous effect, nor can it achieve such a long-lasting luminous time.” Diameter of the watch is 42MM, thickness is 12.75MM, material is grade 5 titanium and zirconium oxide ceramic rotating ring, and a pair of fluororubber embossed pattern and titanium buckle strap are included.