TZ has been used by IMI as a headstamp identifier since at least the late 1970s.
It's possible, however, that a Yugoslavian company is using TZ, as well. Headstamps aren't particularly exclusive to any company or nation, and there's no international agreements of which I know that mandate headstamp identification specifications internationally.
I'm going to go ahead and close this thread. It's 5 years old now and there's no real reason for it to keep growing.
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