The guard is obviously a replacement, since the thumbrest didn't move to that location before 1974, and the blackguard is something from '75. It looks like the bridgepickup is in the 60's position, which places the body at the right era. Same applies for the headstock. It looks like a matching headstock, which was something that wasn't done in the seventies. Also the CBS-tuners (non-Schaller made) and the big TV-friendly-logo with the "curly script" and the trussrod at the heel are correct. Thumbrest has a "brownish hue" to it, which I saw before on late '60s basses.
It's hard to see on the pictures, but the bridge seems to miss the longer intonation screw on the G-saddle, while having the barrel-saddles, and that is period correct.
I think it's safe to say this could be very well a 1969 Jazz Bass, but with a replaced pickguard.
EDIT: This is a '68, with the correct guard on it: http://www.chicagomusicexchange.com/...recently-sold/