Shown below are S170691, 4-inch, shipped on July 23,1957; S179546, 5-inch (one of twenty-one known), shipped on September 15, 1958; S168922, 6 1/2-inch, shipped on July 23, 1957; S221748 (MOD-29), shipped on February 1, 1963. Single click on the photos for a closer look.
Bill
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