Is it a skewed sampling on my part, or have others noticed that ref. 145.012 often has missing dial lume, and shows the characteristic white underneath, whereas the flat-lugs seem to show this less frequently?

 

I have noticed same.

I wrote this earlier today

http://speedmaster101.com/category/blog/

 

Awesome post William!

Any theories on why these lose the lume? Make up of the compound? Not as dolled up because they are (were!) the least favoured of the 321's?

 

Fortunately not all of them.