1969 Dart Swinger

What do you guys think about this being an early production car with 68 vents, could that be true? I just decoded the fender tag:

LM23:
Dodge Dart,Demon
Medium
2 Door Hardtop

P9B: 340 275HP 1-4BBL 8 CYL
1969
Dodge Main, Hamtramck, MI, USA

204187: Sequence number

E55: 340 cid 4 barrel V8 275hp
D21: 4 Speed Manual Transmission
B5: Bright Blue Metallic Exterior Color
D2B: Trim - Luxury, Vinyl Bench Seat, Blue
B7: Medium Blue Metallic Int. Door Frames
B08: Build Date: November 08
092640: Order number

A46: Unknown Top Color
L31: Hood/Fender Mounted Turn Signals
M21: Roof drip rail moldings
V1W: Unknown
V88: Tranverse Stripes, Deleted
END: End of Sales Codes