Seagull ST1812
Factory specs
- Caliber
- ST1812
- Made in
- China
- Frequency
- 28,800 bph (4 Hz)
- Power reserve
- —
- Jewels
- —
- Hacking
- Yes
- Hand winding
- Yes
- Accuracy
- —
- Diameter
- 25.6 mm
- Height
- 3.91 mm
- Functions
- Hours, Minutes, Seconds, Date
- Clone of
- ETA 2892-A2
Tianjin Seagull's slim three-hand date automatic from the ST18 family, built on the ETA 2892-A2 layout. Grail Watch lists central hours, minutes and seconds, a date at 3 with quick correction, hacking, hand winding and bidirectional central-rotor winding; Caliber Corner (ST18 family page) agrees on hacking, hand winding and quickset date. No Seagull spec sheet was found. 28,800 vph is given by both (Caliber Corner notes one Seagull site quotes 21,600, which it treats as an error). Diameter 25.6mm and height 3.91mm are Caliber Corner's figures for the ST18 family; Grail Watch leaves both blank. Not recorded because sources conflict: jewels (21 or 23 per Grail Watch, 21 or 24 per Caliber Corner; some examples add a barrel-arbor jewel) and power reserve (41h per Grail Watch, about 42h per Caliber Corner). Grail Watch notes differences from the 2892-A2: a fixed-pin balance instead of Etachron (Caliber Corner says the regulator varies), a fully slotted regulator eccentric, and a six-spoke fourth wheel.
Watches with the Seagull ST1812
| Watch | Price from | Movement | Dia. mm | Thick mm | Crystal | Micro-adjust |
|---|---|---|---|---|---|---|
 San Martin SN0110 37mm |
$376 | Seagull ST1812 | 37 | 9.8 | Sapphire | no bracelet |