Quoted from Blackzarak:
New to the hobby here.
Hi guys I’m happy to say I found a premium NIB with Adam west signature card and production date from December from the info I read on here that production run is the best Run because it has all the fixes ? (So I Hope) any help will be greatly appreciated. Happy to be in club
Welcome to club! Based on your Batman66 purchase its obvious you are a very intelligent pinsider with discriminating taste. Congrats on getting a signed Adam West card!
There were two stern service bulletins (#189, #190) related to the game. I think new games have these fixes but you should check. You can see the Stern service bulletins here.
The other early fixes were the left ramp flap and ball diverter for the batgirl plastic. Heres some pics of what those look like. Your game should have those.
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Some of the earlier games had kinda wimpy leg brackets in the cabinet corners. I think newer games might have "beefier" ones now to reduce the chance of cabinet splitting. If you have cheap style brackets you can reinforce the corners using this guide from Rotordave.