I'm trying to help the widow of my friend determine value and sell his 1990 Miata. Is there such a thing as a VIN decoder for Mazda, I know there is for my Porsches. I saw the car last night and it has a high wow factor inside and out. Bought new 6/29/90, cared for all this time by 1 owner. Has 65000 miles, and according to widow has : Package A, AC, LSD, Alloys, PS, Leather wrap wheel. I'd like to figure out if it does have all this stuff and its value. From reading a little bit it seems like if it was manufactured prion to March 31, 1989 it may have additional value. I don't know why. Can I look up the build date. Thanks for your help.