Actually the YH looks good. I think the 27 is good. I cant make out the month,but it is bogus. K19 10 27 is a real date. I have had a few of them.I believe they were 70 Monte Carlo wheels most likely,since its a date that comes up very often. I have had Jan , feb , april, may, aug, sept,oct 69 YH wheels.Ive never seen a March, June,July YH.
This is from my experience.I dont claim it as gospel.
Chris.