Steve your Trim Tag decodes as follows.
5 =====> Fifth Month,
C =====> Third Week of,
62 ====> 1962 the year it was made. Which is your date code.
1847 ===> tells you that you are the proud owner of a two door Impala sport coupe (Hard Top).
JA ====> made at the Janesville, WI assembly plant.
27523 ==> is the Fisher Body Sequence number assigned to this build (has nothing to do with the VIN).
842 ===> It left the factory with a blue clot bench seat.
912 ===> is the paint code that says it was originally Silver Blue (light blue metallic)
First option code group
E ====> Tinted Glass
Z ====> Unknown (not in any of my books)
W ====> Tinted Windshield Only