Seiko Chronograph 821817 Blue Dial Stainless Steel Watch – Running

Seiko Flightmaster SND255 men’s pilot chronograph featuring a striking blue sunray dial and rotating aviation slide-rule bezel. Powered by the reliable Seiko 7T92 Japanese quartz chronograph movement. Features three chronograph subdials, a 1/20-second counter, date window at 3 o’clock, luminous hands and hour markers, stainless-steel case, and original Seiko stainless-steel bracelet with signed clasp.

Specifications:

• Brand: Seiko
• Model: Flightmaster SND255
• Reference: 7T92-0CF0
• Serial number: 821817
• Approximate year: 2008
• Movement: Seiko 7T92 quartz chronograph
• Dial: Blue
• Case and bracelet: Stainless steel
• Bezel: Rotating aviation slide rule
• Date display: 3 o’clock
• Water-resistance marking: 10 bar/100 meters
• Condition: Running

Core Bezel Functions Aviation Slide Rule (Logarithmic Scale) Unit Conversions: Aligning the outer bezel index with inner dial markings allows quick conversions between fuel volume, weight, and distance (e.g., US Gallons to Imperial Gallons, Liters, or Pounds / Kilograms). Speed, Distance & Time Calculations: Functions as a mechanical slide rule ($A/B = C/D$). By matching rate-of-climb or speed (knots/mph) against time markers, you can compute elapsed distance, fuel consumption rates, or estimated time en route (ETA). Basic Math: Performs multiplication, division, and ratios by aligning outer and inner numerical scales. Compass Navigation Scale The outer ring includes directional indicators (N, S, E, W along with azimuth degree markings). Solar Compass Method: In the Northern Hemisphere, point the hour hand at the sun. Halfway between the hour hand and the 12 o'clock marker represents South. Rotate the bezel to align the S mark with that midpoint to orient yourself to cardinal directions.

Pre-owned condition with visible scratches, scuffs, and normal wear to the case and bracelet. The blue dial and slide-rule bezel present nicely. Water resistance has not been tested and is not guaranteed. Please review all photographs for the exact cosmetic condition.