Wow. That's the first I've ever heard of this! Hard to believe it would have been assigned a separate model number, since it would be 100% identical to the 120V US M0001 128K. An external converter wouldn't warrant a different model number on the main unit, or a 220V agency label. If this analogue board is a replacement, they also replaced the agency label (unless the original label was erroneously applied, which would explain why folks down under plugged it directly into the wall). I presume this changed with the 512K? And if so, perhaps the 128K got an upgraded PSB at that time, but before Apple started using the 128K bucket badge - explaining why this 128K has a 240V agency label (it was manufactured during the 37th week of '84, which is the second week of September which is the same week the 512K was introduced).
Either way, I would love to see a picture of, and get a model number for an original Apple transformer. Was it just a non-discript brick, or did it have the "Manock" treatment? Was this only for the Macintosh, or was it something that was sold for the Apple II and Lisa as well (or did those computers have 220V PSUs)?
Even more flakey, huh? Yeah I suppose I can believe that. More things to go wrong.