Seagull Caliber TY2872 (ST1655) Watch Movement

Manufacturer	Tianjin Sea-Gull
Caliber Number	TY2872 / ST1655 (ST-1655)
Movement Type	Automatic, self-winding mechanical
Lignes	11.5”’
Diameter	26mm
Height	6.4mm
Jewel Count	21 jewels
Beat Rate / Frequency	21,600 bph / 3 Hz
Lift Angle	Unconfirmed
Power Reserve	~40 hours
Hand-Windable?	Yes
Anti-Shock Device	Incabloc style
Regulator?	Yes with fine tuning index
Escapement Type	Lever style
Hand Count	6
Functions	Central hours; central minutes; central seconds; pointer date subdial at 3:00; day of the week subdial at 9:00; month window at 1:00; year window at 11:00; 24 hour indicator subdial at 6:00 with day/night (aka sun/moon) disc indicator behind it
Hacking Seconds?	Yes
Country of Manufacture	Made in China
Known Models	Corgeut Calburn Courborne “Moon Phase” (Add your watches to the comments below…)

The Sea-Gull caliber TY2872 / ST-1655 is an automatic movement with a triple-date calendar complication, as well as a day/night indicator (often misrepresented as a moonphase indicator) and pointer style 24 hour indicator.

This calibre is part of Seagull’s ST16 family of movements, with framework based on the Miyota 8200 series (8215) with modules for the calendar system. It also utilizes a Seiko Magic Lever style bi-directional winding mechanism. (So, yeah, with watch designs based on Patek, movement framework based on Miyota/Citizen, winding based on Seiko, there’s a whole lot of borrowed IP here lol.)

Some of the topics covered in this caliber listing:

How to set the date?

Date – Bottom pusher on the right side
Day – Bottom pusher on the left
Month – Top pusher on the right
Year – Top pusher on the left

The year only goes to 2033.

The faux moonphase is a day/night indicator which follows the main time. The same for the 24 hour hand, it follows the main hour hand. Neither can be set independently.

Replacement Prices:

At the time of this post, replacement prices for the TY2872/ST16S5 movement were found online in the range of $38.00 USD to $48.00 USD.

Quick FAQs:

Does this movement have a moonphase indicator?
No. There is a moon image on the indicator for about 12 hours, but the other side has a sun image. It is a day/night indicator, not a proper moonphase (despite what others call it).

Watches with this movement:

This movement allows affordable watch companies (factories in China) to make homage/knockoff timepieces that resemble the $180,000 Patek Philippe Grand Complication (Ref: 5207P with caliber CH 29-535 PS Q). It also looks like that Breitling Premier B25 Datora 42 (caliber B25). Those two pieces are chronograph watches, and the Seagull is a faux chronograph (it has the buttons, but they control the calendar).

Below are the most common watches with the Sea-Gull TY2872 / ST16S5: Corgeut Calburn Courborne.