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Pioneer used a simple conversion system to register the manufacturing date from the Serial Number found at the back of your player, demodulator, etc.
Until mid-1990's, it looks like the pattern was composed of A (letters) and 0 (digits) as follows: AA0000000A or AA0000000AA. For example, my LD-S9 is QI1004529P.
Starting mid-1990's, the scheme changed somehow to also used the AAAA000000AA such as SESA021316YY (CLD-D925) or BBTT006968JP (HLD-X9).
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