Here's another "French Twist" - when I bought my PX-10 in '72, it had an Ideale saddle - Mod 80. Of course, the other two PX-10's in the shop both had Brooks Pros. I bought the one with the French saddle!! Of course it was white and the other one in my size was blue (didn't want a blue PX-10!).
By the way (Tom!) I forgot to mention (in my previous post) the 90 also has engraved rivets).