Seagull Seagull ST1901

The Seagull ST1901 is a hand-wound chronograph with a column-wheel mechanism, essentially a clone of the Swiss Venus 175. It operates at 21,600 vph with a power reserve of 42-51 hours and contains 21-22 jewels. The movement is used by brands including Sugess in their 1963-style chronographs and by Mercer, who assembles and regulates some variants in New Jersey. It remains in production.