First, I want to point out the photo used here is from Aero Leather''s website (detail shot of AL's Aero 16160). If posting such a photo is contrary to the rules here, I apologize in advance. Now, I've got a LONG way to go before I can attain the rank of Thread-Counter so please don't laugh. I've been reading a lot about zippers lately, but I can't find another zipper stop like the one in the photo. What iteration is that? It almost looks like a C stop that was installed in the manner of a modern stop. Would it have been an intermediate improvement to the conventional C stop?