Polyglas Decode Help Needed

[1969z280]

I worked at a Goodyear Store as a kid in school as a tire buster. The reason they date coded the tires was to be able to tell if they were still under warranty (defect) and could be pro-rated. As I recall, the date code was simply stamped backwards (i.e. year, date, month) but this does not seem to apply to the stamping that you indicated. The best that I can surmise is that the tire is from 1971. Hope that helps.

Ed