All About Pocket Knives

I found this at a pawn shop several years ago and have difficulties dating as it has different types of blade markings. Please excuse the picture orientation. New phone and it has outsmarted me.

Thanks again. I was trying to research this folder using the Roberson dating thread it had too many variables for me to figure out. 1916 to 1939 is what the thread link you provided. Far older than I thought it was.

That's a very nice 750 pattern stockman.

When dating a Robeson knife, ignore the stamps on the secondary blades. They are meaningless, as far as I know and there are multiple possible combinations.