Scott Baret said:

For the Classic I, there were analog board differences (see the CRT thread). Some very early logic boards are slightly different, too.

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From what I have seen here vs. what I own, I've seen that there are about 3 Classic IIs. Mine - which has 4 ROMs in sockets (mine is a prototype of sorts as it has EPROMs and Apple Printed labels on the EPROMs but I seen a couple with ROMs in the sockets). and two types with 2 ROMs in sockets. Incidentally, my Classic II does not have speaker holes in the case.