Mort,
Well, those guys at Palmer would have been proud that you've used this cue for the last 35 years and it has held up so well. They would certainly be loving the fact that you would rather find a good shaft for it than to buy a new cue.
It's a first catalog Model #1 based on the Brunswick bar cue. This cue would have normally been made in the 1965 - 67 time period. It's obvious that yours was made at a later date and you ordered it from the first catalog cues, which were still available at the time. The first catalog cersion had a slightly different brass shaft insert. The insert was flat and the shaft had a larger wooden tenon. Your shaft and joint set-up looks like 2nd catalog to me, which was right for the date.
Any good cue maker should be able to make you a shaft. I would recommend Jim Buss because he makes good playing shafts and does nice work on Palmers. Scott Sherbine makes a nice shaft and he can match your collar exactly. I would save the old shaft "as is" for collectibility.
One suggestion: If you keep playing with the cue, a rubber bumper would be a good idea - the same kind they use on a SouthWest cue. Even though the cue didn't come with a bumper, this will minimize the possibilty of breaking your butt cap.
Thanks for the pics!
All the best,
Chris