Slowakische Kassettensite mit allen Einlegern

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At  1987 the only real big TDK plants outside of Japan were Irvine USA and Rammelsbach GER... so from the code most probably Japan.
Korea is still difficult to say... no information available... maybe they had a smaller own assembling plant for some time, or used a contractor to assemble japan made parts.
I would guess the latter...