Question about high altitude flight suit from 1952 Made by David Clark Company It

[sweeetj99]

is a model S-4 w/ a helmet? I have a high altitude flight suit from 1952 Made by David Clark Company It is a model S-4 w/ a helmet that reads on top front msgt martinez it has an inspection certificate from 1952 I want to know if any one can give me more information about msgt martinez and what this item could be worth

thanks