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Subtotal: £120.00 Price: £120.00 + VAT if applicable

SKU: G240A Packaged weight: 9.55kg
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A variation on our most popular Calendar clock.

There are fewer of these clocks out in the wild than the standard rectangular calendar clocks mainly because of their size.
They are bigger than your average clock. Please do measure up where you plan on it going before you hit the buy button.

There was a requirement from the NHS doing the rounds a few years ago for a calendar clock with an 18 inch (450mm) dial to go into the hospital wards. This clock fulfilled it but, as is sometimes the way with these things, the inquiry went quiet and nothing came of it. All this said, these quite often go into communal areas and some do still end up peoples homes. Nice and big for those with very poor eyesight.

Primarily for use by people who are finding it difficult to keep track of the days and months.
They are particularly useful in Assisted Living situations and for people living with Alzheimer's or Dementia.

The 'big deal' with this clock is Twemco's patented Perpetual Calendar technology that automates the long and short months and also leap years.
As anyone knows who has a relative who is losing track of the days, being well orientated within the week as just as important as knowing where you are within the day. This clock provides a well built solution that you know can be relied upon with little to no intervention. Just make the adjustments at summer / winter time changes, change the battery every couple of years and everything else is taken care of.

The clock is has Dementia Design Accredited Product status, awarded by The University of Stirling in 2019.

The G239A has a large, easy to read 230mm diameter clock-face linked to a fully automatic calendar.

A single 'AA' battery, which should last you a couple of years or so depending on the brand, is supplied with the clock.
There's a high quality German movement at the heart of the clock that will provide you with an accuracy of about 1.5 sec/month at normal operating temperatures.

Clock operation is straightforward:
Time is adjusted via a wheel on the back of the movement situated behind a removable panel on the back of the clock.
The date is adjusted via sliders, also on the back. All the instructions are printed on the clock so you can never lose them..


  • Dimension: 450 diameter x 85 mm
  • Weight: 4 kg
  • Height of number plates: 35 mm
  • Height of digits: 25 mm
  • Readability: Over 12 meters

Made in Hong Kong by TWEMCO

All clocks are fully repairable and serviceable. Work is carried out here, by us, in our workshop in the UK.

We've been selling TWEMCO clocks for more than three decades now and, as the exclusive UK importer, it is a partnership we are proud of.
What TWEMCO say about themselves:

"TWEMCO is one of the world-renowned manufacturers specializing in fully automatic flip clocks for over half a century.
Since 1968, TWEMCO had started developing the best fully automatic perpetual calendar digital clocks for people.
With over 50 years of experience and by virtue of its excellent craftsmanship and unique features (Invention Patented), we now have nearly one million pieces of TWEMCO clocks sold to market.
Now, TWEMCO has become an icon of fashion, interpreting the value of time."

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