Heat treated preform. If it was a finished knife that edge would be straight. Wavy edge means unfinished. Also, there is an overshot flake scar. The flake was detached on the left edge and traveled all the way across and took out opposite edge. Paleo Clovis makers used that technique often but yours isn’t paleo and was probably done accidentally.
I’m still not able to wrap my mind around how the base looks snapped straight down in one pic and finished in the other… anyway maybe that overshot on the side also caused the break? Maybe not necessarily the same strike but started a crack and they tossed it when it snapped
it looks like a cobbs triangular to me
the images does not show the edge from the side view, except at the break.
Is there any bevel on the blade other edges?
it looks like there is some micocrystline inclusions, which some say looks like a break. this is not seen in all flint types