Great Deals on Authentic Preowned & Used Martin Braun Watches! We Buy, Sell, Trade, Repair, & Consign. Martin Braun was born in 1964. Martin was introduced to watches at an early age, so many believe watchmaking was in his blood. In 1991 Martin and his father worked together and created mechanical masterpieces when the mechanical renaissance just started. Many people consider preowned Martin Braun watches, used Martin Braun watches & second hand Martin Braun watches all the same, but a Gray & Martin Braun watch is something different altogether. All our Martin Braun timepieces are serviced and polished to like new condition and come with our twelve month warranty and "Like New for Life" policy. Our after sales service commitment is second to none in the world, backed by our six in house Swiss-trained watchmakers and jewelers.