What are these bats?

[slidekellyslide]

Can anyone tell me what the deal is with these bats? Obviously black bat Louisville Sluggers, but I can't make out the logo that each bat appears to have stamped on it. The only name that I think I see there is Carl Yastrzemski.

[parker1b2]

Looks like the bicentennial logo

http://sports.mearsonlineauctions.com/LotDetail.aspx?inventoryid=64127

[slidekellyslide]

Thanks! That's it. Much appreciated.