To me, making fully separate pages for the Ever-Ready 1912 from the GEM 1912, the Star 1912, etc. would be a bit silly. They're all effectively the same razor made by the same company just marketed under different brands. There's more variation within the GEM brand -- with the low-profile head vs. the standard one, for example -- than there is between the 1912s under the Ever-Ready or Star labels.
On the other hand, if what you're looking to do here is create something more like an index, where the 1912 links under each brand all point to the same page then that's probably fine. It's primarily the various ASR brands that we're going to have this problem with, but there are others.
For example, I'm 99.9% sure that the razor we've got listed as the "Stoll Chrome Steel" by the Wilbert Cutlery Co. was actually just a white label job of the "Star Cru-Steel" razor made by Kampfe Bros., which our list appears to be missing. (See mine below.) Same with the Hero Safety Razor, which our list also appears to be missing. It was Richard Kampfe who held the April 14, 1914 patent, so it's most likely that they were the actual manufacturer. Of course, they could have also licensed the patent out, but the fact that the razors are so incredibly similar probably makes that less likely.
On the other hand, if what you're looking to do here is create something more like an index, where the 1912 links under each brand all point to the same page then that's probably fine. It's primarily the various ASR brands that we're going to have this problem with, but there are others.
For example, I'm 99.9% sure that the razor we've got listed as the "Stoll Chrome Steel" by the Wilbert Cutlery Co. was actually just a white label job of the "Star Cru-Steel" razor made by Kampfe Bros., which our list appears to be missing. (See mine below.) Same with the Hero Safety Razor, which our list also appears to be missing. It was Richard Kampfe who held the April 14, 1914 patent, so it's most likely that they were the actual manufacturer. Of course, they could have also licensed the patent out, but the fact that the razors are so incredibly similar probably makes that less likely.