It came out in Japan in 1996 and was the third of the Protrek Triple Sensor watches.

On the European Casio site, the PRT-40 is shown as one of the watches in their milestone list with a 1998 release date, so I think it was just late coming out of Japan.

As this was a Japanese release, and the module date starts in 1995, i think this was an early PTR-40 model.

The BirdLife International organisation is a global collaboration between different conservation organisations.

The organisation is in charge of the official Red List of birds requiring protection.

It has a large and robust design with a round LCD display in the centre.

The LCD display is made up of three rows and a display round the edge of 60 markers for seconds or as a part of the compass.

The other parts of the LCD are the time at the bottom, date or temperature height in the middle, and a small dot matrix at the top (for day or mode).

Modes on the watch include altitude temperature (with altitude graph on the dot matrix), data recall (for heights and temperatures), alarm (x5), and stopwatch.

The compass is not accessed through the mode button, but the bearing button.

It also connects to the secondary cord fastening with a Protrek branded hook, which makes sure that the watch cant accidently fall off.

I too found my old one and have just installed some fresh batteries.

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I started this blog so that I could share my (slightly excessive) collection as I wore them.

I generally collect anything interesting and unusual, but specialise in Citizen Independent 1481010, and Tokima Robot watches.

Casio Protrek Prt 40 Manual