Long story short-
I have Monitor 10s (1979?)
One MW6500 (gray cardboard ring) dies
I have a spare MW6500 (no cardboard ring) which I temporarily install
I order another MW6500 (gray cardboard ring)
New MW6500 arrives but is not the same as the original.
The basket, the thickness of the cardboard ring, markings and the excursion are all different. (no further scientific measurements taken)
So, the question is, how many different MW6500s are there.
Or for that matter, how many versions of each MW65xx exist?
Could we make a list with pics and numbers?
I don't as of now know how this could best be organized. I'll post pictures as soon as the camera battery charges and see what the response to this thread is.