> So, they developed a revision and sold this unit while at the same time, they already > had the next one finished?
Yes. It takes several weeks normally between a revision going gold and it appearing in shipping machines. You have to run the new version through QA and then change over the production line (which is not trivial or fast, since it involves shutting down the line temporarily).
Because the MAME dumps are all from real machines obviously both versions did ship to arcades. As for the dates being before the ship date, obviously you want to build x number of machines before launch to cover pre-orders and stragglers and that doesn't happen instantaneously.
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