Nice collection. Back in the '70s I had a complete collection (or at least everything on their list) including mint F, FTV and FTs in black and chrome. The collection was not intended but, back then I had a hanckering for 1/2 frame format and the lcal camera dealers were taking the cameras in trade left and right for next to nothing and calling me to come and get them, sometimes for nothing.
A local dealed called one day and asked if I could bring the F collection to the store as he had a possible buyer. It turned out to be the Olympus rep who was buying all the Fs and accessories he could lay his hands on and reselling them into the medical profession. He had tried to get Olympus to do a production run of the medical F (oh, I did not have 1, sorry) but they declined. Apparently the doctors, etc. were using them in the labs and loved them for personal use also.
This lead to my trading in of my entire collection of cameras in exchange for my Bronica system, a Minox LX and ML and my Rolleiflex T. I still have the Rolleiflex and Bronica systems.
Sadly, and belatedly, I realized just how nice a collection I had of the F series and really missed it as I used part of the collection back as a daily shooter and carried it where ever I went. The only saving grace was the Minox LX and ML that tooks it place for such duty but not as happily. The Pen cameras I found had some of the best lenses of all the Asian lenses regardless of manufacturer as they learned, like Minox, that for small format lens quality had to be so much better to be competitive and when I decided to opt for a dslr, this helped me decide on an Olympus and I've found they seem to have not lost their capability at least for making extremely good standard kit lenses.