Since this thread was started (all those years ago), I have learned that one 44 Magnum with a 3 1/2-inch barrel and bright blue finish was made by S&W. It has serial number S177427 and was shipped on January 30, 1959.
This makes the known lengths for this model at: 3 1/2, 4, 4 1/2, 5, 5 1/2, 6, 6 1/2, 7 1/2, and 8 3/8-inches (this is up through the 29-2 model variation).
Bill
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