There were three suits made and only one worked (not this one). The others had a round viewing window, like a diving helmet, rather than this square, welding mask style one. I've used this image, because I've already used the other on Oobject and incorrectly, as a diving suit. The Wiley Post suit is where the aesthetics of deep sea and high altitude overlap, before they diverged almost completely.
View the entire chart: pressure suits