Anyone who feels at home on the world's seas, be it as an experienced sailor or enthusiastic water sports enthusiast, knows what to look out for: the weather - and often enough the tides. Because ebb and flow determine the rhythm of life on the coasts. Whichever port you call at, a comparison with the local tide table to determine the current tidal range is mandatory. However, it is also essential to look at the clock - especially if it is equipped with an internal tidal bezel like the 240 St GZ. With the tide bezel, the relative water level of a location for the current tide, i.e. until the next high tide, can be read off directly. You just need to know the time of the last flood and match it with the triangular "HW 1" on the rotating bezel. You can find this point in time on a tide table or the tide calendar, for example. You can read the current water level with the help of the hour hand directly on the tide bezel of the 240 St GZ. You can also read off the expected relative water levels for any time up to the next flood, and the time for the next flood is then displayed at position "HW 2".


  • Diameter:


  • Case Material:

    Stainless Steel, Bead-Blasted

  • Case Back:

    Screwed Bottom

  • Movement:

    Automatic, Self-Winding

  • Water Resistance

    10 Bar

  • Calibre:

    SW 220-1

  • Features:

    Hour, Minute, Second
    Date Display
    Weekday Display
    Internal Tidal Bezel
    Crowns With The D3 System
    Antimagnetic According To DIN 8309
    Meets The Technical Requirements Of DIN 8310 For Water Resistance

  • Frequency:

    28,800 Semi-Oscillations Per Hour

  • Dial:

    Deep Blue Dial

  • Strap:

    H Link Bracelet


Send us a message

PMT The Hour Glass is proud to be the exclusive retailer of Sinn in Singapore and Malaysia.

Locate a Sinn boutique near you.


Watches of Switzerland

Jewel Changi Airport
78 Airport Boulevard
Singapore 819666

(65) 6531 0898

Monday to Sunday:
10.00am to 10.00pm

The Hour Glass

Parkway Parade
80 Marine Parade Road
#01-47 to 52
Singapore 449269

(65) 6348 9869

Monday to Sunday:
11.00am to 8.00pm

Watches of Switzerland

290 Orchard Road
#01-19 to 20
Singapore 238859

(65) 6732 9793

Monday to Sunday:
10.00am to 9.00pm

Watches of Switzerland

23 Serangoon Central
Singapore 556083

(65) 6908 4489

Monday to Sunday:
11.00am to 9.00pm

Watches of Switzerland

Tampines Mall
4 Tampines Central 5
Singapore 529510

(65) 6783 6535

Monday to Sunday:
11.00am to 9.00pm

Watches of Switzerland

1 Harbourfront Walk
Singapore 098585

(65) 6376 9727

Temporarily Closed


The Hour Glass

Gurney Plaza
Lot G-03, Ground Floor
170 Persiaran Gurney
10250 Georgetown

(60) 4 226 2350

Monday to Sunday:
10:00am to 10:00pm

Watches of Switzerland

The Gardens Mall
Lot G-208A&B, Ground Floor
Lingkaran Syed Putra
59200 Kuala Lumpur

(60) 3 2201 6811

Monday to Sunday:
10:00am to 10:00pm

We’re here to help

Loading Consult A Specialist Form


Share via:

To find out more about our available positions, please visit our Careers page.