LEGO Minifigure Head - Classic Smile, Yellow – DASHBRICK
LEGO Faces: What do they tell us? - Minifigures.com Blog
minifigures - Where can I get 'classic' Lego heads from? - Bricks
BrickLink - Part 3626bp03 : LEGO Minifigure, Head Standard Grin with Pointed Moustache Pattern - Blocked Open Stud [Minifigure, Head] - BrickLink Reference Catalog
Classic Smiley Face - Personal Members Gallery - Rock Raiders United
Classic face print looks awesome in modern minfigiures : r/lego