Mine was supposed to be built Nov. week 1, actual built date was 11/30, and shipped right out 12/4,5,6 can't remember now.
I don't know where I read that Mazda produces their special cars at the end of the run. It kind of makes sense since mine is not the only car that got built and shipped right out (within a week).
FYI... There are only 2 voyages per month from Hiroshima to East Coast, and 4 for the West Coast (MITSUI O.S.K lines).