Fujitsu date codes
For a while, I believed that I understood the correlation between Fujitsu serial numbers and manufacture dates. Each Fujitsu keyboard I came across was a perfect fit into the scheme I discovered. Subsequently I have found that more of them do not fit this pattern than do fit, so it appears that they had several different serial number systems on the go at the same time.
On this page, I list only the “main sequence” examples: those keyboards that do fit the pattern. At some later date I may expand the page to show all the counterexamples. Amongst the counterexamples, I have yet to find another scheme, although there are some brief periods of correlation between examples.
Sometimes, these letters only appear on internal serial numbers found on the PCB, not the external serial number found on the case. This is particularly true of OEM products where the customer has placed their own product label onto the outside of the case. Sometimes there is both an external and internal Fujitsu serial number, and it is the internal serial number that fits the pattern in this case (assuming either of them fit).
jpspace’s Fujitsu Micro 8 is an interesting example: the IC dates are all 1981, but the keyboard module has an ‘X’ serial number, which should be 1982.
The confirmed date range so far:
|Y||1983||Epson Q703C-AA (HaaTa)||Second generation leaf spring||049989 / Y55690|
|D||1988||Fujitsu FMR30KB501 (MouseFan)||Third generation leaf spring||P8Y03855 / DY03767t|
|H||1992||Triumph FKB4700 (klikkyklik)||Peerless type 2||H1390872|
|1992||Escom FKB4804-103 (niubio)||Plug and toilet||H7075277|
|I||1993||My own unbranded FKB4700||Peerless type 2||I6005425|
|J||1994||Fujitsu OAKB-406 (MouseFan)||Third generation leaf spring||175835 / J600023t|
|L||1996||Fujitsu F7956KB1 (“jpspace”)||Post-Peerless||1479+L801859 / L801888e|
|M||1997||Fujitsu FKB8726-353 (niubio)||Dome with slider||M9058886|
|P||2000||Fujitsu FKB4725-501 (rzwv)||Peerless type 2||PZ294887|
H and I are confirmed by FKB4700 keyboards; this is the label from mine (something I omitted from my original photo shoot):