TISSOT T-CLASSIC T-ONE AUTOMATIC 38 MM MEN WATCH T038.430.16.037.00

The ETA 2834-2 is an automatic movement with a day-and-date calendar, and sources consistently identify it as the caliber used in this reference. One specification database lists 29 mm movement diameter, 5.05 mm thickness and 25 jewels.

Design

The watch has a fairly conservative dress-watch aesthetic: a silver dial, polished stainless-steel case, traditional index markers and a brown leather strap. The day and date displays are the defining practical feature of the dial. The transparent back allows the wearer to see the automatic movement. 

Movement: ETA 2834-2

This is an important part of the watch's appeal. The ETA 2834-2 is a Swiss automatic movement based on ETA's 28xx family and is specifically designed to provide day and date indications.

Its key characteristics are:

• Automatic winding
• 25 jewels
• 28,800 vph / 4 Hz
• Approximately 38-hour power reserve
• Central hours/minutes
• Central seconds
• Day display
• Date display

For a watch from this period, it's a practical and relatively straightforward movement to service compared with many modern proprietary movements.

Crystal and water resistance

The watch uses sapphire crystal, which is significantly more scratch-resistant than conventional mineral glass. Several independent listings specifically identify the crystal as scratch-resistant sapphire.

Its 50 m water resistance makes it suitable for everyday exposure to splashes and rain, but I would treat it as an everyday/dress watch rather than a swimming or diving watch.

Strap

The original configuration is a brown leather strap. Interestingly, an original Tissot replacement strap is identified as T600029097, with a 19 mm lug/strap width and brown leather construction.