I've been hunting pcbs on ebay since 2001 and the revisions are random. Even if you got all the SF2 collectors on a board like Klov to note their collection, your sample pool would still be too small for accuracy. From your example you would be asking 20 people and tens of thousands of the boards were made. But you aren't even doing that, you are asking here. For mame users not even 1 in 1,000 have ever even seen an arcade pcb in real life. Nobody knows what they played in arcades either because they never saw the boot screen. Someone could give you an educated guess but a percentage of it would be talking out of their ass.
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