I've come across an interesting surgical straight razor online, but it is the only example I can find. It is incredibly frustrating, lol.

So it is a Wocher, and as far as I can tell, all markings are on the metal scales, not the razor. When I try searching, either here or the interwebz as a whole, the only results returned are for medical instrument catalogs. So I know, vaguely, why this razor exists: as part of a suite of instruments doctors could buy. I just don't know who/where?

Anyway. There is an interesting feature that caught my eye. It looks like some sort of locking mechanism, but can't be sure without having it in my hands.

The feature of interest...
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What do you guys think? Any ideas or further information about it?

Thanks in advance for your thoughtful responses!