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enter image description here Trying to find out who signatures is on this Basebball . I received it as a birthday present

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This is a David Ortiz autograph. "B.P." almost certainly stands for "Big Papi", Ortiz's very common nickname.

There are many examples. Here is his Baseball Almanac page.

Exhibit A (last card on page):

David Ortiz Signed Baseball Card

Exhibit B (note the 34 in the signature):

David Ortiz Signed Baseball

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