If i come across my 100 yr old German folder with the secondary as lock release i will post pics here. I have too many unsorted knives to go through, would take me many hours, but i will keep a look out for it. When my collection got to over about 5,000 knives i could no longer keep them organized, which is a problem. Part of the fun of collecting is being able to find a specific knife when you want to, like now. What's the point of having a knife if i can't find it ?
kj
kj, I feel for you. At first glance a guy thinks, "5000 knives! Wow!" but as a fellow collector, I know what you mean.
My Big collection is comic books. I have many thousands, more than I could ever reread in my lifetime and I'm relatively young.

I took a hiatus from pocket knives for quite a while but then discovered GEC. Now that's outta control, lol.
But my hobbies are fun and usually keep me out of trouble. Hope you find that knife, kj!