Statistics for occurrence #1 of “J. S. C. Proven” in chapter 137 of Rebellion Record: a Diary of American Events: Documents and Narratives, Volume 8.:

...Welles, Secretary of the Navy, Washington, D. C. List of Guns captured at Fort De Russy water-battery.--One thirty-two pounder, thirty-three hundred weight, F. P. F., No. 227, navy, in barbette, J. S. C. Proven 1847. One thirty-one pounder, thirty-three hundred weight, F. P. F., No. 226, navy, in barbette, J. S. C. Proven 1847. Two nine-inch Dahlgren guns. No marks could be discovered on these gun...
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