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@WimVDD
My guess: it's a 1991 (first digit, here "1" in the serial number indicates the year; the A means January) PR (it has the seat post binder in the seatstays and has a frame number holder) 4000. I believe it is 4000 because it has the smooth curved head tube lugs where 5000 and 6000 have a "dented" one. You can see it clearly on head tubes pics here
http://www.speedbicycles.ch/velo/410/panasonic_pr6000_1993.html