I just has a look at your SRP thread, The special was probably manufactured by the same makers of the one you are interested in…
It was common for manufacturers to have razors stamped differently to satisfy the demands of independent distributors, the basic form of the razor would be the same, but the tang stamp would be different, incidentally, the decoration (etching) would often be the similar, as in this case “Magnetic Diamond Steel”, and let’s not forget “Full Hollow Ground” or Extra Hollow Ground” or even “Fully Warranted” depending on the popular marketing catch phrase at the time.
For example... I have 2 razors, one with Imperial Razor 20509, stamped on the tang, and the blade etched “The Improved Eagle Razor” an eagle with spears in its talons. I have another razor with the same form, the same etching with same text, but with Loin Brand Yankee Cutlery Co stamped on the tang… who made them? I suspect both were made by the same manufacturer… or at the time it was the “wild-wild-west” when it came to copying decoration.
Another example... 2 razors one with “T- Hessen-Burch & Co” and a bear inspecting a pole stamped on the front tang... “Perfection Warranted” and again, a bear inspecting a pole stamped on the rear side of the tang.
The other razor, “C. Morgan and Sons” on the front tang, and the exact same tang stampings on the rear side as the T-Hessen-Burch mentioned above. Also, they both have a bear inspecting a pole molded into the front scale “will “bear” inspection”). Who made them? most likely the same factory, but customized for different distributors.
Manufacturers still do this today… where did I hear that Dovo manufactures FROMM razors?... and bunch of other brands.
With all that said it may still be a modern knock-off... but you will never know for sure until you have it in hand.