Is this a factory stripe??

looks like they have a code!

LL29:
Dodge Dart,Demon
Low
2 Door Sports Hardtop

C1E: 225 145HP 1-1BBL 6 CYL
1971
Los Angeles, CA, USA

: Sequence number

E24: 225 cid 1 barrel 6 Cylinder 145hp
D13: 3 Speed Manual Transmission-Floor Shift
GY8: Gold Poly Exterior Color
M1XX: Trim - Opt. Decor Group, Unknown, White/Black
TX9: Black Int. Door Frames
921: Build Date: September 21
086874: Order number

GY8: Gold Poly Top Color
U: USA Specifications
A46: Moulding Package
M21: Roof drip rail moldings
M43: Grille Trim Moldings
R11: Radio Solid State AM (2 Watts)

V6X: Longitudinal Stripes, Black
V8X: Tranverse Stripes, Black
Y14: Sold Car
END: End of Sales Codes