As Austin has stated, his are a year or two before Pearl used Keller shells. Here is my thread for the US Maple Pearl's that I found last November.
http://vintagedrumforum.com/showthread.php?t=61033
You can see that the badge states "US Maple". There are some other differences.
I believe Austin's toms will have mufflers for the batter heads, the US Maples do not have these. The US Maples also do not have the "Maple Shell" badge, have two badges on the mounted toms, and all have dual breathers.
I've seen his kit over on the Pearl forum. I've also rubbed it in that I have the matching 8X14 snare with the parallel strainer..... Walking
His Jupiter snare though is really sweet, so he doesn't need to be too jealous!!
Just messing with ya!
Steve