Probably originally it was a Bravo 3. . . but I suspect that a Bravo 1 lower unit was put on during a rebuild, rather than a Bravo 3. The upper units are interchangeable.
Yup, often you see a bravo 1 lower unit put on when needing a rebuild or replacement, due to the huge cost of the bravo 3 . . . Not that the bravo 1 is inexpensive either.