Just my opinion...

The greatest misperception about straight razors, and the reason that razor prices are so ridiculously skewed, is that bigger straight razors are better. By far, the most common size among straight razors made in the past 100 years is the 5/8. There is a simple reason for that. They worked!

Now all of the razor makers are pressured to make bigger razors, because the smaller ones just don't sell, or command a significantly lower price. The required amount of effort for making the smaller blades is virtually the same, but the prices they command just cannot justify the bother of trying to make them.

The same problem exists for vintage blades. It's hard to sell a 5/8 blade, but the larger ones get snapped up.

Here is the reality. 5/8 blades work just great! Bigger is not always better.