Can someone tell me when it was made ?

Ladies and Gentlemen, I'm trying to find out exactly when my 71 GS convertible was made... Someone told me you have to decode the body tag.. Anyone know the deal on this?... I am including pictures of the vin and body plates
... please help.. Thank you Lou

 

By my sleuthing April 5th week - 18th - 30th

http://www.drivinithome.com/gm-body-tag-decoding/

 

Thank you so much !