That's a good looking spare. I never knew Michelin was an OEM supplier to Mopar in the old days.
Hate to rain on your parade, but tires made before 2000 used only a single digit date code. That could be a 71, 81, or 91 year of manufacturer. Somewhere in the 90s, DOT realized that people were keeping tires on their cars for more than ten years. From 2000 on, the date code went to two digits.
I learned all of this due to a recent experience I had with a great looking spare on my 73. (Photo below) As you can see, the tire had plenty of tread. This baby let go with all the force of a Sprint Cup car blow-out. Chunks of rubber and sparks (from the tread belt flopping around in the fender) went everywhere. The car veered towards the weeds violently. I was going about 65 at the time.
The date code read 3. I concur with the tire tech who junked the tire for me that it was probably made in 1983.
