Seiko Professional 600 Men's Divers watch Colectors' item. Husband bought this watch in 1979 from a jeweler in Townsville, Qld. Australia. It is the last of the Seiko grandfather tuna originals that were ever made as production of these  ceased in that year. There is no "M" after the 600.  She is in beautiful condition as in pictures.  Everything is working as it should. No defects, scratches, etc.   Band missing due to age (wear and tear).   Has been to the Seiko Hq. in Manila for a complete service.  It has not been worn much since then as kept in the sock drawer. Not many of these old Seiko classics is left in perfect working order.  Even the 4 titanium shroud screws are orginal.