OK, I have a Puch Pacifica out in the garage and it does have the Japanese tubing. It is not Reynolds, I know that for a fact. It may be Ishiwata or Tange, but may also just be "chro-mo" . Its two thirty a.m. and I can't sleep but if I go into the garage now to check I'll wake the family.
I'll check for you tomorrow. The seatpost size is either 25.4mm or 26.4mm, honestly I think its the first one. That's exactly one inch by the way. I have a nice American Classic silver microadjusting post in mine.