Limited edtion of 500 pieces bell ross watch br01 instrument de marine br01 cm 203 a design very different to most bell and ross watches the bell and ross br 01 instrument de marine watch has been designed with the inspiration of a legendary 18th century clock in mind john harrison who was widely known as an artisan carpenter and watchmaker invented a marine chronometer in 1720 that had the ability to calculate the longitude while at sea his invention significantly improved the safety