Eterna Watch KonTiki Diver Gent Blue 1290.41.49.1417. The inspiration for the watch itself comes from a vintage Eterna dive watch from the 1970s. Divers at the time used no decompression tables developed by the US Navy to determine how many minutes they could safely spend at each depth and still go directly to the surface. By adhering to these tables, divers could avoid having to pause for decompression during ascent and ward o the bends.