12A: Build Date, December, First Week
Style, 64-2237: 1964 Model Year, Pontiac Division, LeMans, Hardtop Sports Coupe
Data Tag Decode as follows
Copied and pasted from the '64-'65 tech page where I asked. Thanks nexus31)
Body, PO 1616: Pontiac, MI Plant, Fisher Body Number
Trim, 214: Interior Trim, Black
Paint J-2: Pinehurst Green Metallic Paint, Black Cordova Vinyl Top
Accessory: 1W, Tinted Glass (Windshield Only); 2Y, Cordova Top or Two Tone Paint; 2P, Back Up Lamps; 5N, GTO Option; 5W, Custom Seat Belts with Retractors.