Oh boy such will take me ages to collect all of them.... I think i already posted the serial of the turboR once... Every once in a while when i wander on the attic of my shed i find msx stuff i don't even recall 
But my question is: what's the use of this (besides just for the fun of it)?
There's, besides for the fun of it, probably not much use. But maybe, if there's enough serials, some person sees the bigger picture behind them. For example, the Philips Music Modules (NMS 1205) have a serial that starts with HK and on the module it's printed that it's made in Hong Kong. The Philips computers have a serial that starts with FF... Very curious.
Some other manufacturers seem to have an ongoing serial number, look at Sony, where I kinda get the feeling that whatever machine passed through the final stage of assembly got the next free serial... But to make sure, we need more... It might be wiki material if the code is broken 
For fun and possible help,sure. 
Hello 
,
Computers :
Philips VG8020/19 : FF02-535013362 (French model)
Philips NMS8280-00 : FF027-51012175
Sony HB-F500P : 400080
Sony HB-F700F : 401872
Sony HB-G900P : 400022
Sony HB-G900P : 400124
Sony HB-G900AP : 400250
Sony HB-G900AP : 400323 (French model Azerty)
Sony Videotizer HBI-G900P : 400275
Sony Videotizer HBI-G900P : 400799
Sony HB-F900 : 207547
Sony A/V Creator HBI-F900 : 203464
Monitor and ..... :
Philips Music Module NMS 1205 : HK002486
Sony Monitor KX14CP1 : 5003008
Sony Monitor KX14CP1 : 5003676
Sony Monitor KX14CP1 : 5004869
Sony Bit Corders SDC-600S : 410008
TurboSEB: You Sony fan! You've got a nice set of professional Sony MSX stuff there!
My Sony KX14CP1: 5008484
TurboSEB: You Sony fan! 
You've got a nice set of professional Sony MSX stuff there!
The proof :
