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Current calibre families used by Sea-Gull
ST6 – 3 sub-families:
Woman-size automatic, hand-wind or hand-wind skeleton
Man-size automatic, with various calendar and 24-hour/day-night display options
Hand-wind, rectangular form-movement with open heart
ST16 – Miyota-style simplified construction with Seiko-style auto-winding. Many calendar and 24-hour display options available.
ST17 – Upgraded ST16 with even more options including jump-hour, big date and power-reserve. Skeleton versions, both automatic and hand-winding.
ST18 – Clone of ETA 2892 (Often incorrectly referred to as ST26)
ST19 – Hand-winding chronograph developed from Venus 175. Seven different variants being produced:
ST1901: 2 register, small seconds at 9, 30 min counter at 3
ST1902: 3 register, small seconds at 9, 30 min counter at 3, 12 h register at 6 that mirrors the time-keeping hour hand
ST1903: 3 register, small seconds at 9, 30 min counter at 3, 24 h register at 6 that is not affiliated with the chronograph function
ST1904: unused model number, possibly being reserved for an automatic winding or true 3 register chronograph version
ST1905: 2 register, small seconds at 9, 30 min counter at 3, decentral power reserve at 4:30
ST1906: 2 register, small seconds at 9, 30 min counter at 3, decentral power reserve at 6
ST1907: 2 register, small seconds at 9, 30 min counter at 3, central power reserve indicator
ST1908: 4 register, small seconds at 9, 30 min counter at 3, date at 12, real moon phase at
ST1940: 2 register, small seconds at 9, 30 min counter at 3, automatic
ST21 – Clone of ETA 2824-2 (Often incorrectly referred to as ST24)
ST22 – A pair of small ST6 automatics on a common dial plate. Open-heart and big-date options.
ST25 – Premium movement with double-bridged balance for open-heart. Various calendar options. Top specification is a perpetual calendar with day, date, month, moonphase and 4-year cycle
ST28 – AS1475-style hand-winding alarm.
ST31 – Unusual bowtie-shaped movement with linear train, open-heart, subsidiary seconds and day/night indicator. Also available as skeleton.
ST36 – Unitas-style 36mm pocket-watch movement, hand-winding with subsidiary seconds. Skeleton version with unusual bar-type bridges.
ST80 – Blancpain-style flying caroussel-tourbillon. Various calendar and power-reserve options. Hand-winding or automatic. Skeleton version is hand-wind only, no options.
ST82 – Tourbillon with large-diameter balance on common axis with carriage. Hand-winding or automatic. 'Flying' or bridged tourbillon.
ST8080 – Hand-winding dual tourbillon; caroussel and common axis.
ST84 – Hand-winding common axis tourbillon. Narrow for movement suitable for women's watches.
ST90 – Hand-winding quarter-repeater.
ST91 – Hand-winding minute-repeater.
Note: A thorough comparison of the Sea-Gull ST21 (ETA 2824 clone) and a ST18 (ETA 2892 clone) movements can be found on the TZ-UK forum: (In this article, the movements are incorrectly referred to as ST24 and ST26)