Tudor Caliber T401-901

Brand	Tudor
Caliber Number	T401-901
Movement Type	Automatic, self-winding mechanical
Lignes	11.5”’
Diameter	25.6mm
Height	Unconfirmed
Jewel Count	21 jewels
Beat Rate / Frequency	28,800 bph / 4 Hz
Lift Angle	51 degrees
Power Reserve	42 hours
Hand-Windable?	Yes
Anti-Shock Device	Incabloc
Hand Count	5
Functions	Central hours; central minutes; central sweeping seconds; pointer date subdial at 6:00; alarm on/off indicator at 9:00; alarm power reserve indicator at 3:00
Hacking Seconds?	Yes
Country of Manufacture	Switzerland, Swiss made
Known Models	Tudor Heritage Advisor (Add your watch to the comments below…)

The Tudor caliber T401-901 is an automatic movement with a mechanical alarm function. While the base movement is an ETA 2892-A2, the alarm complication is a Tudor module.

In the official user manual (page 9), Tudor refers to the movement as a “TUDOR calibre 2892 with additional mechanism for the alarm function”.

Mechanical Alarm:

Watches with the calibre T401-901 have two crowns and a pusher button on the side of the case.

Crown at 4:00 (time)

• Against the case – Manual-winding
• Pulled out 1click – Date-setting
• Pulled out 2 clicks – Time-setting

Crown at 2:00 (alarm)

• Against the case – Nothing
• Pulled out 1 click – Alarm winding
• Pulled out 2 clicks – Alarm time-setting

Pusher at 8:00 (alarm)

• Alarm on/off button

Alarm FAQs:

Can you over-wind the alarm?
Yes. Follow the guidance on the alarm power reserve indicator at 3:00 on the dial.

Which direction winds the alarm?
Clockwise.

How long does the alarm buzz?
About 10 seconds on the full wind.

Additional Resources:

• Official Tudor Heritage Advisor user manual (pdf)
• More “Tudor” mentions