12D = 4 week of December build
66- 4 44 17 BODY BF 2343
66- = 1966
4 = Buick
44 = base V8 Skylark vin, could be optioned to a premium engine, Gran Sport would have been a '46', a base v6 car or California GS would have been '43'
17 = 2dr Hardtop Sport Coupe
BODY BF = Framingham, MA
2343 = sequential production # of the body, different than the last 6 of the VIN
TR 181 = Blue interior, could be cloth or vinyl
PAINT DC = two tone Astro Blue and Arctic White
24094 = option codes, sorry i don't have