I didn't realize there was a question in your prior post.
According to
THIS web page, that would be a 30th week of "1" year;
Quote:
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Tires built before 2000 featured a three-digit date code at the end of the Tire Identification Number. The first two digits of the date code tell you the week that the tires were built, and the last digit tells you the year. For example, a date code such as 306 would let you know that the tire was built in the 30th week of a year ending in 6. There could be confusion of whether the digit refers to 1976, 1986 or 1996, so let’s dig a little deeper.
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If the tire is as old as you say, then it would be indicating that it's likely from the 30th week of 1971.
You neglected to tell us the actual tire size;
If it's an G
R70-14, then I'd put odds more likely as it being from 1981.