I have reason to believe that the following Buster Posey was used by someone other than him

http://cgi.ebay.com/Buster-Posey-Gam...item3f048c83b0

I believe that Giants Minor Leauge First Basemen Brett Pill used this bat at some point due to the presence of the word "Pill" on the knob.

This is a reasonable assumption because they both played together in Fresno this season and this can be verified by looking at their individual Milb.com player profile pages

Brett Pill:

http://web.minorleaguebaseball.com/m...pbp&pid=489209

Buster Posey:

http://web.minorleaguebaseball.com/m...pbp&pid=457763

And the amount of pine tar on the bat is consistent with the application shown in the following pictures:

http://www.flickr.com/photos/gadgetc...36224/sizes/o/

http://www.flickr.com/photos/gadgetc...20286/sizes/o/