Corum was founded in 1955 in La Chaux-de-Fonds.  In that time, they have been known for a number of watches that to the uninitiated seem like merely interesting design exercises.  But a closer look reveals that several of these are actually technical watchmaking innovations.  For example, in 1960 a square watch in the Admiral line was released – the first water resistant square watch ever made.  This is quite non-trivial because generally round is an inherently better shape for sealing purposes…just try to find any square seams on a submarine!  In 1964, the Coin Watch was released – a watch so thin that it could fit into an actual gold coin.  In 1980 the watch that Corum is most known for was released – the Golden Bridge.  Invented by AHCI co-founder Vincent Calabrese, the Golden Bridge put the movement of the watch in the front and center…the importance of this is hard to overstate in that era as mechanical watches were teetering on the precipice of extinction.  For this reason, the Golden Bridge has been called one of the watches that helped usher in the current golden age of Independent and watchmaker-centric watchmaking.