M.A.S.K. is an American cartoon that ran for a few years in the 80s with some killer intro music. Their promotional material included these stickers (sized at ~1.5×2.25in) which came in packs of seven. Many are cropped as they're meant to be pieced together with their respective counterparts for complete images. I find the odd framing really interesting. There are 126 here. I think there’re about 385 in total. They can be found on Etsy.
Feel free to use these scans for commercial purposes (under fair use). Crediting me or this repository is appreciated.