BBQ,
02D would work out to Feb 4th week of the month, more specifically, Feb 19-24.
Febuary of 1962 actually had 5 weeks the car could have been built, a short first one , then 4 full weeks.
Also something to keep in mine, this tag shows the body build date. This car could have been assembled as late as late march 62. My research has uncovered a 1962 built Impala with 10D, 4th October 61, car was ordered, still in hands of original owner, assembled in early December and delivered Dec 14, 1961. So in this case the body was built/tagged almost 2 months before delivery.
Take care, Gary