I am very happy to find this thin cased 5508 non crown guard. The 5508 Submariner replaced the similar in appearance 6536 and 6536-1 with 1030 caliber. These thin case models were produced for a short time and A ball park production figure for the 5508 Submariner would be from late 1957 to 62. The foremost advantage which the 5508 model shared over the 6536 examples was that it housed the updated 1530 caliber. For a collector or watchmaker this 1530 caliber made it easier to maintain then the harder to find 1030.
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