it is a proto I have a few old mizuno techfires in diffrent colors. they made a few full production samples in different colors before they made a final choice on color and graphics/name for each bat. good find looks to be in good shape for its age swing it and enjoy it.
I have a classic with a 2 inch crack in the sweet spot of the barrel. I have hit over 1000 balls since it cracked and the bat is still going strong. the crack is the same size and hits great these bats are tanks it should last a long time.