Hi Ron,
What you have is a store bat -- the BP refers to Boog's initials, the 5 indicates the length of the bat (35 inches). Any combination of the player's intitials and a number indicating length (usually 3, 4 or 5) means it is a store bat. I'm guessing it probably says Flame Tempered to the right of the center oval, which also appears on store bats.
Greg
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