Only 4 have more than the listed minimum gain so really only selling the 4 the other 4 might good for testing or experimenting. These were found in old military equipment and buried in Heat conducting clay in a large heat sink and the identifying numbers have been mostly obliterated. Enough was left on several to determine the numbers. They were all found together so I think it is reasonable to assume they are all the same. I guarantee the 4 to be good let me know if my findings cannot be verified.