Module

Model: 108 (for Men's watch)
Battery: 391 Face: LCD 6 digit + week + alarm  Light: YES Year: 1980 Buttons: Four buttons are used: top right, bottom right, top left, and bottom left.
Function: It displays hours, minutes, seconds, day, and month, as well as alarm or chime, stopwatch, and countdown timers. It also features a built-in light.
Info: This module is used in the following model TI-809-31

 
Here you can see the specific contact used by the button when pressed. Four buttons are used: one in the top right, one in the bottom right, one in the top left, and one in the bottom right. The top right button allows you to select the time, date, and seconds and start the stopwatches; the top left button allows you to activate and deactivate the alarm; the bottom left button allows you to set the time, date, and day of the week, alarm, stopwatch, and countdown; and the bottom right button allows you to activate the backlight via the micro bulb.

 In these last two photos you can see the micro buzzer at the top and where it goes into the watch case.