If I recall correctly, almost for all Pony Canyon A-ko CD, first print limited edition always come with clear back (no cover) and color picture disc.
On the picture, both discs were swapped; it is intended to see picture disc through jewel case...
Other companies like Polydor, Sony and Victor also did that but in a more simplier way; usually first press had color picture disc while normal edition had a black and white picture disc though there were some exceptions.
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