Looks similar to a couple i had - one was black, red and white- had the same white plastic grille - had a 10HP teccy , i knew that one was early because it didnt have posts for a magneto, had a 'brain box' and points.
I also had a blue one similar to yours, cept that had been pretty much stripped tho - had these huge rear tires and trans pulley - thing had a cigarette lighter also .
Im not sure if its one of those rare ' Richard Petty ' blue ones - reguardless, id restore it to original . i dont think that seat is original either - i have an original 82 dynamark , along with the the 10HP teccy one- they both had lowback black seats.
After a certain point, dynamark went to black grilles - so its probably an early one- if it has a briggs motor- check the 1st two digits of the code on the flywheel shroud - thats the year of the motor