Fujitsu serial number date codes
Fujitsu used multiple serial number formats. The “main sequence” format appears to be as follows:
The positions have the following interpretations:
- Year of production (A–Z); see under examples below
- Month of production (0–9, X–Z); see table below
- Serial digits (four up to around 1984, and five from around 1985 onwards)
- A suffix letter, not explained; often “t”, but “e” has also been seen
The year is represented with a single character, using every letter of the alphabet, and wrapping around from Z back to A in 1985. It has been confirmed for the year range 1982–2005. See 富士通の板バネ式メカニカルキーボードについてのまとめページ -- 各種考察 for more details.
The month codes are as follows:
Internal and external serial numbers
Many Fujitsu keyboards use separate serial numbers internally and externally. In these cases, the main sequence serial number is recorded on the internal label affixed to the PCB. Where there is only an external serial number, this may also follow the main sequence (as with FKB4700 models), but often it does not. External serial numbers may use a prefix letter and still not match. A number of mismatching examples could be found on rzwv’s site, but that has since been deleted, along with all the serial numbers. The mismatching examples tend to be membrane keyboards.
The confirmed date range for the main sequence so far is given below.
Additional examples are given at 富士通の板バネ式メカニカルキーボードについてのまとめページ -- 製品データベース, although there are no photos of the dates (only the serial numbers), so they are not listed below.
|Prefix||Year||Keyboard||Switch||External serial||Internal serial|
|X||1982||Fujitsu Micro 8 (“jpspace”) (ICs are dated late 81)||FES-360||—||X29296|
|unknown (ICs are dated late 81/start of 82)||FES-360||11820381||X30616|
|Fujitsu Micro 16s keyboard||DIN-compliant dual-discrete leaf spring||XX0005||X90005|
|Y||1983||Epson Q703C-AA (HaaTa)||Dual-discrete leaf spring||Y55690|
|Z||1984||Sony OA-S3400 keyboard||FES-4||—||Z53677 t|
|A||1985||Fujitsu FM77AV keyboard (“jpspace”)||Semi-discrete DIN leaf spring||AZ11755||—|
|D||1988||Fujitsu FMR30KB501 (MouseFan)||DIN-compliant dual-discrete leaf spring||P8Y03855||DY03767t|
|1988||Fujitsu FMR-30BX keyboard (Kiyoto)||Non-discrete membrane leaf spring||D202053|
|E||1989||MAI VDT keyboard||Non-discrete membrane leaf spring||E201649|
|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)||DIN-compliant dual-discrete leaf spring||175835||J600023t|
|K||1995||Fujitsu FMV-KB211 (sandy55)||DIN-compliant dual-discrete leaf spring||34239 02B||KZ22648t|
|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||—|