Another one from my collection - NO history on it. Signatures looks like Phil Collins, Jan Hamer, Jeff Porcaro and Tommy Bolin.
I would like to know if Tommy could be a good one. Jeff looks like the ones that I´ve collected in the past, but I´m not sure about the others I´ve brightened the scan as the signature of Jeff and Tommy not good visible on the original dark cover. What makes me thinking it could be real is that Bolins signature seems to be aged with the record sleeve.... if you know what I mean. Sorry - don´t know how to explain it - would be cool to see a german forum here... :-)
anyway, lets go on - and I would be glad to see authentic signatures to verify, too!
click images for supersize view!

