in 1953, tudor launched a campaign based on robustness tests of the oyster prince and its endurance in difficult conditions. the adverts included a watch worn by a coal miner during 252 hours of hand excavation, a watch subjected to the vibrations of a pneumatic drill for 30 hours worn by a stone cutter for three months, a watch worn for a month while riveting metal girders is metal construction and a watch worn by a motorbike racer over a distance of 1,000 miles. as time went by, tudor began narrowing its focus on watches with a more technical design inspired by professions regarded as dangerous. these watches had particular functional features, for example divers' models with date or chronograph function. the people selected for the tudor prince submariner and tudor prince date-day advertising campaigns of the time were not well-known personalities but rather chosen for their profession. they included rescue divers, mining engineers and rally drivers, all photographed with their equipment.