whoever had the cool idea for the artwork on this deserves an award for awesome ideas! I'm going to guess these were 1930-1950s, the deep sea diver is a great character

there was a variant of this design

https://www.worthpoint.com/worthopedia/vintage-whiz-instant-radiator-sealer-165721794

via https://dailytimewaster.blogspot.com/2022/03/stuff-you-find-in-back-of-garage.html

I'm not going to go buy the whole set, but I sure as hell am going to look around the internet to POST the whole set... these are a hoot! 

https://www.worthpoint.com/worthopedia/early-1940s-vintage-whiz-metal-seal-50917927

there was another in this line, but not quite the same color palate

https://www.worthpoint.com/worthopedia/antique-vintage-whiz-kleen-flush-2007177328

the ultimate collection of ALL the Whiz products was something I did post already, but I didn't notice the deep sea diver art... http://justacarguy.blogspot.com/2020/04/traveling-salesman-display-with-twenty.html