Chan Eil Whiskers
Fumbling about.
My bad Jim, my " chrome ' handle is in fact aluminum and a different shape from the professional handle of yours. It has a 24.5 knot, and your post made me move it to tonights brush. I don't have a scale to weigh anything this small, but it is quite light, lighter than my aluminum handle Zenith boars, heavier than a plastic Zenith or Omega. My resin Manchurian has the tall "retro" handle in white . Now you have me back looking at the black handle M7 which has been pulling on me for awhile, in fact I even requested that style last year. I just looked, and my aluminum brush is the M6. I don't know how much longer I can hold out on the M7.
I know exactly which brush you're talking about with the aluminum handle. The eBay vendor calls it a "normal" handle.
Kitchen scales are very useful if you're into this hobby (and who isn't).
Happy shaves,
Jim