There are no markings that I can see. However, a similar dagger / knife I found online was French and from the 1800's. I know very little about this dagger, including the provenance. Hence, please review the accompanying photos carefully. In my estimation, the dagger is in very good condition.
The item "1800s single blade mother of pearl folding dagger / folding knife, rare antique" is in sale since Sunday, March 1, 2020. This item is in the category "Collectibles\Knives, Swords & Blades\Daggers".The seller is "alldaypicker" and is located in Irvine, California. This item can be shipped to United States.