have you contacted the jansen shop in AUkcland? The folk there are quite friendly, i've heard./ A mate of mine had a lovey old Jansen bass, and after chatting with these folk heard some great stories about their guitar maker. Apparently the quality of the pickups depended on what day of the week it was - if you had a goood sounding guitar it was probably made mid week, but bad sounding ones were usually made on monday, after the fellow had a boozy weekend and was a bit hungover.
There was a good artiucle in NZ Musician on jansen guitars several years ago - contact them and they maybe able to sell you a back issue of it.

Cheers guys, didnt realise there was a Jansen store in Ak as I'm down here in Duds. If anybody else has any info it would be greatly appreciated.

I have a 68 Jansen Jazzmaster which I love. Its been seriously overhauled as it was apparently in terrible condition. It now has a fender neck and new pick ups. the pickups were made yo the jansen speck though...with original jansen coil that was bought up by a few obsessives when ther factory shut down. Mel at Weta guitars did the work and I highly recomend that store for NZ amps and gats.