I am not sure about actual production figures, but the earliest version of mil-spec Mil-M-50717 is from April 1969, already specifying both types I and II and classes A and B for both. The mil-spec was officially canceled in 1984.
Please note that both types were for "submersible and navigation" purposes.
Hope that helps.
PS: I'd send you a copy, but the PDF-file is 16MB, and I don't think my Mail programs can handle that.