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The T prefix indicates .22 LR and was used on the Auto 22 rifle beginning in 1956 until sometime in 1961. They started using serial numbers in 1956, too. How many did they make each year? I have no clue, but yours must be fairly early. First year maybe.
In 1961 they started their serial numbers with a number and a letter: 1T, 1A or 1E, etc. 1962 numbers started with 2T, and so forth.
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