The movement is a Seagull st19 mechanical (hand winding) chronograph with 21,600 bph. The power reserve of the Seagull movement is about 42 hours on a full wind without the chronograph running.
Technical details of the Seagull 1963 Chronograph:
- Acrylic or Sapphire with open Caseback
- Movement: Original st19 Seagull hand-winding Chronograph movement; 21 Jewels; 21600 BPH
Power reserve: 42 Hours
- Case Material: 316L Stainless Steel
- Case diameter: 38.00mm
- Case thickness: 12.70mm
- Waterproof: 3 ATM
- Lug to Lug: 46mm
- Bracelet Material: Nylon
- Hands: Polished Steel with Blue Color
- Crown: Pull Out Crown
- Lug Width: 18mm
Should you take a 38mm or a 42mm version of the Seagull 1963 watch?
Most jewelers and watch specialists would argue that a wrist size between 15.3cm (or 6") and 17.8 cm (or 7") would suit both a 38mm and a 42mm.
This means, that if your wrist is smaller than 6", the 38mm is the best fit for you. If your wrist is significantly larger than 7" however, most would advise going with the 42mm.