It is an early 95 as the nib unit is the same as the one from the arrow, I have a 95 that i bought in 1994 and the nib is slightly different, the 'parker' inscription was dropped and there is a small cut out on the back of the feed (much like the vector). the other difference is that later 95's were sodl with the twist type piston converter, the converter in yours is the same as the one that I got with my earliest arrow (1982 Q4). Interestingly the date code PL is the same on my GT 95 Flighter. The opinion that parker used up spares of arrow caps does sound reasonable, even though my cap has '95' stamped on it, but there could be a logical explanation:
The main weakness of the arrow is the 2 piece pocket clip, prone to sprains and breaking welds, so it is likely that there would be a considerable number of spare clipless arrow caps that could be used up in production of the 95
Also there is a reason the 95 came into being - not only does the design distance the pen further from the cheapie vectors and bring it more up to date, it also resolves the main problem with the arrow therefore reducing the number of pens being repaired under guarantee and saving money!
The only other issue with these pens that i can find is the band that holds the cap on can wear down and the cap becomes loose. I have heard people complain about drying out issues, but I have 5 Arrows/95's with different converters and have never had this problem.