Here is my F300 cone. I have had it for around 5 years. Due to traveling and Covid it has sat in a Safe since I got it. As you can see, it has plenty of plastic on it. I bought it from the son of a man who had an Omega Dealership. It had lay forgotten in a Safe since the late 70s.
It is, but it wears much smaller than it looks, this is due to the case being smaller at the top than at its base. It does sit relatively hight on the wrist, but nothing compared to something like the Flightmaster.
My duo says hello, it’s just amazing how many types of different dialed 300Hz’s there are - I wonder if 198.001 is the serial with the most dials out there, yours is truly beautiful and it’s the first time I’m seeing one
I think placing the caseback on an ultrasonic cleaner could simply dislocate it? As an idea