johnk_10 said:in 1975, jazz basses did not come in a fretless model. you may have been able to custom order one, but it would have had a precision bass neck on it, and even that is very unlikely since by '75 the jazz bass had a three bolt neck and the p bass always remained a four bolt. and matching headstocks was more of a '60's-early 70's feature, and i can't remember seeing an actual '75 with a matching headstock, but they probably made some in very limited numbers.
it seems that you are unfamiliar with the jazz bass's changes over the years (it was introduced in 1960), since in order to make/build a 'period correct' replica, the parameters that you require didn't exist.
I'm not as familiar with basses as I am with guitars. I don't find as much information. I'm not even gunna go there with drum sets.