Just curious if anyone knows when the first GEM blades were manufactured. I'm wondering when manufacturers discontinued making wedge blades for the new style GEM type blades. Thanks in advance.
I don't think anyone is alive who knows the answer. You might write to the American Safety Razor Company and inquire. You might search for ancient magazine advertisements on ebay or elsewhere on the internet.
This item below may be of interest to you, though it won't answer the question: