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Definitely Conn, not King. You can tell by the "birthday cake" like angles at the receiver (ok, you find a better way to describe it, but you know what I mean). The Kings generally have a straight receiver, or only one "bump." Also, the loop inside the brace is Conn.

Conn. What he said.

Conn.... without question. As others have said, the receiver is the giveaway.

Not being a sousa player, where did you come by them? Just curious.