I suspect that "traditional" is variable by age. I think that knives made after about 1975 are modern. Traditional, to my way of thinking would be a two bladed Imperial. That is the kind of knife I saw, most often, when growing up. I can still remember the cards of knives in the old Standard filling station in my home town. Lots of "fish knives", cheap Barlows, Colonials and Imperials, the inexpensive fixed blades with plastic handles, and in the back room , knives with pictures of undressed women. Traditional costs, as I remember it was a buck, maybe a buck and a quarter, and everything was made in New York. One knife incident that I remember is that I came home (around 1964) with a very fancy colored Texas Toothpick and my father about had a stroke because it was the type of knives carried by "bad people." I specifically remember the word he called it, but today, the word can not be spoken in public, and rightfully so. The term was standard English in the Deep South at the time.
My father was in the plumbing and heating business and always carried a knife, most likely a Colonial or a Imperial two blade, and he always intentionally broke the pen blade to use as a flat head screwdriver. Back then, slotted screws were the standard.