Sony NN3 - Made in?

I have several cakeboxes of these Sony discs.
I read somewhere that the discs could be manufactored in Japan, Taiwan or India.
Where from do I get this information? No ‘Made in xxx’ is anywhere written. Are there secret codes?

Edit:
Sorry - wrong forum.

You can identify their origin with the serial number/hub code. The numbers visible at the clear hub of the disc.

This post should help you discover if they are made in Japan or Taiwan.

(nudged the thread from the Disc Testing subforum to the Blank Media parent forum)

Another example here: 10 pack spindle #10BNR25BSP (25gb BD-R 1x-6x)

I found now the ‘Made in Taiwan’ - I was a little bit blind :wink: