Originally Posted by RaleighSport

I happen to be a student of the school of T-mar.. and have been blessed enough to even have had communication with him about serials since his "departure" but this is from the Sekai database thread that I maintain, if it is indeed a Miki frame this may be of use to you.

70's At least for some Sekais the Y## format and M## one should actually equate ## with the last two digits of their respective year IE. Y77 is 1977, however this does not apply to all Sekai formats.. apparently not even all Mikki or Yamaguchi manufactured frames. Please consult with specs and pictures if you feel your serial is not matching to format.


80's Yamaguchi/Mikki made Sekai frames refer to the quote from T-mar.


Originally Posted by T-Mar
Apparently, Miki made both Sekai and Sakai frames. Sekai frames were manufactured by Miki and assembled by Sakai Export. It not uncommon for a manufacturer to produce more than one brand. The serial number format should be Myfxxxx, where y is a number designating the year and f is a letter designating the fortnight. The same serial number format shows on on some Norco and Centurion models, though it is unclear whether these frames were made by Miki or another manufacturer with the same serial number format. For instance, Merida of Taiwan uses the same format.