Looks like I only have one other LA built A66 car in my database - and it does show J54 on the tag. There goes my LA plant theory - so the mystery remains.
kissalien - can you check your LA cars and see if all or some of them might be missing the J54 code?
As for a decode - I don't see that anyone has done that yet - so here it goes:
E55 - 340 4bbl engine
D32 - 727 3-spd Automatic transmission
JH23 - Base Challenger Two-Door Hardtop
H0E - H is 340 engine/0 is year 1970/E is Assembly Plant Los Angeles
1xxxxx - VIN sequence number
FF4 - Body Color Light Green Metallic
H6F8 - Interior codes - H6 Vinyl Bucket Seats/F8 Color Dark Green
000 - Inside Upper Door color - no extra color applied (full door panels)
C04 - Scheduled production date - December 4th, 1969.
158708 - Vehicle Order Number
FF4 - Roof color/treatment - Light Green Metallic
A66 - Challenger 340 Performance package
- 340 engine, 11" HD Drums, Sport Hood, Rallye Suspension, Transverse Paint Stripe, 26" Radiator.
C16 - Center Console
C55 - Bucket Seats
J45 - Hood Pins
M21 - Drip Rail Mouldings
N41 - Dual Exhaust
N42 - Bright Exhaust Tips
R11 - AM Radio
V9J - Transverse Paint Stripe - J Sublime
26 - 26" Radiator
END - End of Option Codes