Hello Brian. You probably mean the barrel flats are stamped with a T (upper case) with a crescent above and below it. This is Parker Bros. stamp identifying the barrels as "Twist".
A T in a circle is the stamp identifying the barrels as "Titanic Steel" which didn't arrive on the scene until 1898 and were the standard barrels for the D or Grade 3 guns. As far as the other marks are concerned we will probably need a picture to be able to see exactly where they are and what their significance is.
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