I think I'd do it, if:
- You "need" to make room in your livingspace by trading away those 6 or 7 other basses.
- You are "tired of" or not inspired as much as you feel you should be by your current gear.
- You can always replace Fender CS basses, as well the other stuff you're proposing to trade.
- You can only play one bass at a time, so why not focus your financial resources on one great, valuable instrument, that will appreciate in value more than the others, even combined.
- The 1958/9 Pbass is an ICONIC instrument, whereas the others are NOT.
- The 1958/9 basses only come around once in a while, and to be in position to acquire/curate one is rare, and may be once in a lifetime.
- If you have this many high-end basses to trade, you probably have other basses in your collection that you can take out "to the bar gigs", so disregard the "I wouldnt take this to play for the drunken guys in the bar" comments
- Remember, the sports adage "you have to give to get." That seems to be the case here...
- You've already played the 1958/9 - and were swept off your feet, pulse racing, inspired to play all your Stax records with Duck Dunn, fantasizing at all the great music you would make together with this bass!
OP -- I've been in your position before, about 5 years ago. I was able to trade a Fender CS jazz, Fender CS Strat, a Modulus Q6, Gibson CS '60 LP Special, plus cash for a 1962 Fender Precision, much more "worn in" than the 1958/9 you're considering. While I slightly miss the CS Jazz bass, the 1962 has been my main bass since then. I've taken to recording sessions, bar gigs. And I practice on it much of the time. It is the best playing and sounding bass I've ever owned or played, and I've played LOTS of basses. If I had the chance to do it all over again, I wouldnt even hesitate!