L'Ecureuil (Squirrel) is a spearpoint slipjoint with a very strong backspring. Except for blade shape and emblem, it is the same as the Douk-Douk. There are other models as well with the Douk-Douk blade but different emblems, like the Tiki. They come in small and medium, with a Giant also available, but I don't know if that's available in any model but the Douk-Douk. They all have a choice of carbon or stainless blades.
I have carbon and stainless medium Douks, and medium and small Squirrels. The Squirrels seem to me to have a bigger, tougher blade. The backspring is so strong on all the Cognet knives that they make great keychain knives, specially the small. They will not fall open accidentally.
No one hand opening, no flicking, no lock, should be legal just about anywhere. Like the Opinel, they are Old-World, and very good workman's knives.
I recently got my second K55K Mercator, an old German design similar to the Douk-Douk line. The Mercator does have a back lock, though, and is easier to open and close. My first was my high school knife! It was carbon and I wasn't careful; eventually, it corroded so much I replaced it with an electrician's knife.
I find it extremely impressive how you guys can keep track of so many different knives at all!
