Larry or anyone else, have you ever encountered a snap clip with a pronounced horizontal line/groove running under the clover leaf like on this dagger?

Also I cant get my mind around the strange pebbling on the background of the links or what seems to me as very sharp square holes in the individual links.

Am I mistaken or is this chain made of early material like the type A or B1 but has the straight connectors to the clover leaf like the type C chain?

Im confused...