[quote name='noelk27' timestamp='1344267437' post='1761963']
Several different version of the Primary. The PB400 and 450 where alder, and tended to have four or three piece bodies. The PB500 and 550 were sen ash, and tended to be three and two piece bodies. Alder versions usually weight circa 4.0/4.1 kg, with sen versions circa 4.3/4.4 kg. Necks mostly one piece maple, with bonded maple touchboard, although some rosewood versions can be found. Necks are usually slightly slimmer at the nut than the Fender models these are based on: circa 40.0/40.5 mm. Most didn't have DiMarzio pickups fitted, contrary to urban myth. Matsumoku, mostly, bought in pickups from Maxon and Gotoh for these, until it started building its own. You can tell the date from the first three characters of the serial number - letter is month, first two numbers are year.
Knobs: usually chrome, so those might have been replaced. Covers: Usually came with a bridge cover, some models came with a pickup cover also.
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Thanks for this info...this is what is so good about this site. From this, it's a July 1980 model. I've already put on some tele-style chrome knobs (the ones on the photo were black - it didn't have any when I got it, but thankfully the pots were OK). The neck is a single piece of maple, with a glued-on maple fingerboard, the headstock is clearly three pieces, the body is three pieces. I used to own a 1979 Precision (US...weren't they all US back then?) and if memory serves, the neck is certainly slimmer on the Aria.
I'm becoming an advocate of cheap old basses and this one is quite the beaut. Might try and find a Jazzer at some stage.
P