Located on the top of the dash on the driver's side and visible through the windshield from outside the car.

FIRST DIGIT : Identifies GM Division (4 = Buick)

SECOND AND THIRD DIGITS : identify the series

SERIES	CODE
Skylark Sport Wagon GS Skylark Custom LeSabre LeSabre Custom Estate Wagon Centurion Custom Electra 225 Electra 225 Custom Riviera	33 34 34 44 52 54 60 66 82 84 94

FOURTH AND FIFTH DIGITS : identify the body style

BODY STYLE	CODE
2-Door Thin Pillar Sedan Station Wagon 2-Seat Station Wagon 2-Seat (Dual Actioin) 2-Door Hardtop 4-Door Hardtop Station Wagon 3-Seat 2-Door Hardtop 2-Door Hartop Sport Coupe Convertible 4-Door Sedan 2-Door Hardtop	27 35 36 37 39 45 47 57 67 69 87

SIXTH DIGIT : identifies the year (1 = 1971)

SEVENTH DIGIT : identifies the assembly plant

ASSEMBLY PLANT	CODE
Southgate, Calif. Framingham, MA Flint, MI Oshawa, Canada Fairfax, KS Wilminton, DE Fremont, CA	C G H I X Y Z

LAST SIX DIGITS : Represent the basic production sequence

EXAMPLE:
4	52	69	1	H	000000
Buick Div	Series	Body Style	Year	Asm Plant	Prod Code