Under The Side Panel

punkdISCO found this under the side panel of his Korg 900ps. The following are a couple more shots of the inside: one, two. Click the image on the left or the title link for a super sized shot.

The stamps with 58.8.26 is the year in Nengo (Emperor Era), month and day the synth was stamped. 58 would make it 1977? If you know more feel free to comment.

Update via the world of next tuesday in the comments:
""Nengo" is just saying it's a Japanese date, not a Western date. Written properly in English the synth is from the year "Showa 52" (I've seen it abbreviated S52 for instance a lot in Japanese booklets).

I guess the math is 1926+S-1 because there was no year Showa 0. Now "52" is easy to assume as Showa since no recent emperor lived as long as Showa (a.k.a. Hirohito) and the synth has to have either a Showa or Heisei date (1989+H-1), but avoiding confusion you are supposed to add whomever's reign it was or is to the number."
Update via SoNiCbRaT in the comments of this post:

"Hmmm correct me (anyone) if I am wrong... here goes:

C1/R1: Inspection Item
C1/R2: Product Satisfactory Stamp

C2/R1: (I am not sure)
C2/R2: (somebody's name?)

C3/R1: Organization
C3/R2: (a name)

C4/R1: Functionality Check 1
C4/R2: Stamp with date and name

C5/R1: External (cosmetic) Check 1
C5/R2: Stamp with date and name

C6/R1: Functionality Check 2
C6/R2: Stamp with date and name

C7/R1: External (cosmetic) Check 2
C7/R2: Stamp with date and name

C8/R1: Assessories and Packaging
C8/R2: Stamp with date and name

C9/R1: Grading
C9/R2: Passed

Hope I helped..."

C = column
R = row