Giard is rarer on paper items than he is on team baseballs. In addition some people construct framed and matted signature displays of all members of the team, and to do so, you need a Giard.
What makes your ball valuable is that it's a reasonably complete 1927 Yankees team ball, in very good condition. It is the most desired of all team balls--many collector's "Holy Grail."
The key to a particularly desirable 1927 ball is the presence of all the starter's signatures, along with those of the primary pitchers. After that, it's nice to have the rarer autographs--especially manager Huggins--but Giard's presence or absence does not change the value of the ball much, if at all.
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