I wish you would relax a little, it's not necessary to clobber people over the head if they don't agree with you!I know Connaught describe it as 60mm, but I have bought at least 2 brushes from them that had quite different knot lengths from the ones described on their site. I also have a huge file from a few years ago that has a lot of Omegas with all their measurements, and it states 64mm for the 10083. Finally, you might wanna check this post that even has photo of the 10083 and states 65mm Omega 10083, 21762, and 20480 - https://www.badgerandblade.com/forum/threads/omega-10083-21762-and-20480.470319/post-7729009
Just remembered that I bought a second Proraso 2 weeks ago and measured it - it is even shorter than my first - 55.9mm.
You say they are not not that all different. But I am a face latherer and 56 vs 64 (or 65) makes a huge difference for me. I know because I have the 49 (65mm) and it's not exactly the best length for face lathering.
Here's a post that says the loft is 60! So, I don't think we will know for sure unless people start pulling out their calipers and measuring these things.
which omega brush is the new Proraso Professional Boar Hair Shaving Brush?
which omega brush is the new Proraso Professional Boar Hair Shaving Brush?
www.badgerandblade.com
I have an Omega 49 and a Zenith B03-A26 which is supposed to be 57mm loft (nice brush, BTW). I can face lather with either one just fine.