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I bought some about 6 months ago from a UK based seller on eBay.
I used them in a pre war Tech in which they worked really well, they were sharp and smooth over 3 shaves i use a blade for, definitely worth trying.
I have already bought of these from Razorbladesclub Sweden. Medium sharpness but pretty coarse. Similar indeed to the SuperMax Blue Diamond Platinums. Some even speculate that these are made from an offshoot of the SuperMax factory or are rebranded SuperMax blades.