The 1560 caliber was the early 5512 first COSC chronometer movement. It was a 4-liner
and retained the gilt dial minute/chapter ring. Depending on year, these early 5512s
had squared off or pointed crown guards as Rolex was developing crown guards as a
work-in-progress. The added COSC-related lines and depth rating, along with other letter indices of the dial, were gilt or silvery in appearance. A good view of these early Submariner dials and hands for the 5512 may be found in Mark Lerner's "RolexHaven"-an excellent small site devoted to the early Submariner and other tool/sport Rolex references.
As an aside, if considering an extra band for use in addition to the somewhat fragile
and rare riveted bracelets: consider a stylish functional NATO band. They really protect
your watch should a spring bar fail. That is why the military use them as issue items.
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