Howdy ed,
I will echo Karls comment- The Coffex is truly a great find.A beautiful machine! I have its sister, a Maximatic- the same year as yours but not quite as perfect. Mine also came with the original box and foam inserts! They are so close in detail that I almost think they just changed names.. from one to the other? Your wiring shots of the top, down to the wire color are identical to mine.
I have a newd from Richard and some Cremina PF that I have used on my MAX( I just rebuilt it!) I have used the original Oly dbl basket and the Elektra basket in both PF with no problem.
The Elektra basket is the deepest and largest basket of all three of the baskets I know fit. The old La PAvoni 49mm basket, the Elktra Microcasa aLeva and the original of course. (Also 49mm baskets for the Bezzera Family Club lever also fit. But they are probably more rare to find.)
The rims of the Elektra and LP need to be worked on a bit as they flare a tad more that the original Oly basket. Not hard but that always depends on who is doing the work.....
Also for what its worth - I currently have my PStat set to a max pressure of 1.0 bar. Kicks on at .85bar. I have to grind a bit more coarsely than I use for the Cremina( a 1985).
What a nice avatar shot to boot!
\Enjoy!