Slowakische Kassettensite mit allen Einlegern

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I gave it a short try some time ago, from what I remember they used totally different code structures over the years.
(short ones with numbers only, long ones with numbers only, long ones with a lot of letters...)
On some series I was (almost ;-)) confident the last digit is the year.... I gave up.
There are also not that much codes to look at. I only have about 20-30 SKC and SKC OEM tapes to examine...