Bought this off a chap in Mexico, so it has a beautiful tropical dial. I'm guessing this is a late 60s-early 70s. JM (Joske's Mexico) mark on the clasp. They also made bracelets for Rolex and other makers for local Mexico markets. Case 36.5mm Case steel with gold KonTiko medallion. The tropical dial looks great in the sun. £600 £500 Plus postage Free pick up from London. Instagram calibre1970