Revision number of your Powerbook

[spongebob]

This might sound so simple, but how do you determine the revision number of your powerbook? Is it written somewhere on the case?

[directX]

rev A - 867Mhz
rev B - 1 Ghz
rev C - 1.33 Ghz

[spongebob]

Thanks! How about for 1.5GHz? Considered as revision C?