A blank is a proto razor. It is made by a third party in a drop forge. More precisely,
Hugo Herkenrath.
Since making a die for a forge is very costly, most independent razor makers buy what Dovo is having made
en masse. Hence five 6/8 round point razors with thumbnotch (one by Dovo, by Wacker, ...).
So, the steel is the same, the blanks are
mostly the same (I know of one independent razor maker who has his own blanks made). The rest is grinding.
Now, while most "artisan" razors are wedge type razors, hollow grinding has been turned into an art in Solingen, and the well known and well established manufacturers have mastered it. Aust, Revisor,
Heribert Wacker - all capable of producing razors that can easily vie with the best vintage razors. Add to that superior* steel, and you have a winning product.
Scales are either vintage, or new. The standard new ones are mostly made by two Solingen based companies. The high quality ones are made by various independent manufactures all over Europe.
*Yes, seriously. Despite claims to the contrary, steels have actually got better, not worse, since the 1920s...