Rare double tag! It is
very full. Even though DH43N1D202118 had an even fuller
one, that long-defunct GJ4 4-door hardtop is missing the code M15 that your car has for a moulding that I believe is specific to 4-door sedans (code 41 like yours).
Here is a decode for DH41L1D276289, courtesy of
MyMopar with a few edits as the info is not 100% correct (as
@69CoronetRT often points out):
DH: Dodge Monaco (High)
41: 4 Door Sedan
L: 383 275HP 1-2BBL 8 CYL
1: 1971
D: Belvidere, IL, USA
276289: Sequence number
E61: 383 cid 2 barrel V8 290hp
D32: Heavy Duty Automatic Transmission
GE7: Burgundy Poly Exterior Color
H7X9: Trim - High, Cloth & Vinyl, Black
TX9: Black Int. Door Frames
503: Build Date: May 03
123101: Order number
V1X: Full Vinyl Top, Black
U: USA Specifications
A03:
Deluxe Light Package
A07:
A/C Special Package
A24: Trunk & Spare Tire Dress-up
A76:
Brougham Package
A94: Gold Duster Special Package
B51: Power Brakes
C51: Bench Seat-Split 50/50
G11: Tinted Glass (all)
G31: OS RH Manual Standard Mirror
G33: LH Remote Racing Mirror
H51: Air Conditioning with Heater
J25: 3 Speed Wipers
L25: Trunk Lamp
L31: Hood/Fender Mounted Turn Signals
L35: Cornering Lamps
M15:
Up Door Front Moulding
M25: Wide sill moldings
M28: Front Bumper Periphery
M36: Rear Bumper Periphery
M85: Front & Rear Bumper Guards
N88: Auto Speed Control
R13: Deluxe AM Radio (5 1/2 Watts)
V01: Mono Tone Paint Treatment
V5X: Body Side Stripes, Black
Y14: Sold Car
Note: for 1970,
@Bill Watson has informed us that the Brougham Package
included "50/50 split cloth & vinyl bench seat with individual arm rests and reclining seat back, trunk dress up, rear seat sound insulation pad, vinyl roof and "Brougham" nameplates on C-pillar on Monaco models." Not sure if the details are exactly the same for 1971, but his list closely meshes with your tag. For example, here is what the seats of a Brougham look like, courtesy of the
Hamtramck Registry.