So there: There are two main types of serial number on the back of CPC 1) The first serial number are located on a small white label. As "123456 Kxx-yy" 2) The second are shown directly on the main label. As of 10 digits. Interpretation of the first type: As "123456 Kxx-yy" => K is the country of production (K for Korea - South Korea) => Xx is the plant (31 or 32 are the two codes that typically found). => Yy is the year and month of leaving the factory. Directly represents the first year (4 for 1984, 5 for 1985). The second of the month (1 through 9 = January-September and October for X, Y and Z for November to December) => Finally, the 6-digit number is the number sequence from one factory and one year Examples: 93132 K32-54 => Korea factory 32 - April 1985 (a 664) 218 167 K32-5X => Korea Factory 31 - October 1985 (a 6128) 16201 K31-62 => Korea factory 31 - February 1986 (464 is a) This numbering was used until February 1986. It relates to a package of 464, 664 and every part of 6128 (as keyboards "querty") Interpretation of the 2nd type: In the form of 10 digits (often with a dash between the 3rd and 4th digits) => = 1st digit country code (5 for Korea, Thailand for 6) => 2nd and 3rd digit = plant code (found on 31 and 32 but also 33, 35, 41 and 71 for Thailand) => 4th and 5th digits (possibly preceded by a hyphen) = production date (year and month as the previous system) => 5 the following figures correspond to the sequence number of the chain of production (per site per month now) Examples: 5326604065 => Korea Factory 31 - June 1986 (it's a 6128) 533-7316093 => Korea Factory 33 - March 1987 (it's a 464) 671-9408078 => Thailand Factory 71 - April 1989 (it's a 6128) 532-7X06669 => Korea Factory 32 - October 1987 (6128) -------- My 464 : 535-8508757 Korea Factory 35 May 1988
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