A t with the crescents usually means "twist" steel in the barrels. The c over the 4 is the normal grade markings of a "C" grade which is also a grade "4". However, a C grade does not usually carry twist barrels; therefore, I think you are misreading a poorly stamped barrel weight stamp which probably means 4 pounds, 6 (not c) ounces. If the "c" is on the upper right hand corner of the 4, I am correct.
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