Chan Eil Whiskers
Fumbling about.
Kidding aside. Does the white Mondial have a hollow plastic handle?
I picked mine up and messed around with it. Then I picked up several others and did the same. My conclusion is not helpful. I can't really tell with any of my brushes. If there's a surefire method which doesn't involve destroying the brush I don't know it.
I don't have any of the really cheap plastic handled Omegas or Zeniths. I'd think I could tell with the 48 and the Proraso Pro but I can't.
Sorry.
To me the Mondial ivory handle is much nicer than I expected it to be. I don't think it's quite as nice as the Connaught Omega Premium which I believe is turned acrylic resin, but it's nice enough for me to like it.
Happy shaves,
Jim