The “T-12 Skin diver” was advertised in the US for $100 in a collective add for “PR” (particularly rugged) and “T12” (120m depth rating) watches around 1970. This watch is described as “There’s a model just for skin diving”. We can assure you that this 42mm, stainless steel, bracelet (Gay Freres “GF”) watch is useful for a lot of other uses too! The GF-bracelet is dated first quarter of 1970. The serial number on the caliber 784 2 automatic movement also dates the watch to ca 1970. It is in very good condition and runs very accurately for a vintage watch. Rarely seen with it’s original bracelet, and in such good condition, this Navigator is some vintage watch package!