Longines Watch HydroConquest Mens L3.730.4.56.6. Founded in 1832 in Saint-Imier, the famous Swiss watch brand Longines can boast a long tradition characterised by the elegance and performance of its products. Those values are perfectly represented by The Longines Sport Collection. The HydroConquest line is dedicated to men and women looking for a high performance timepiece that combines technical innovation and elegance. Longines now extends this line with new models in bright colours.