Stamped number on car

The stamped number on radiator sup. And on cowl is 139671
Can And one give anymore info. Is this to match last 6 of vin or is this build date?

Model year?

Type of car?

Could be a SO or partial VIN or?

Any letter / number combination in front of those six numbers?

i think in the 70,s that stamped number was the production number on your build sheet

All I have
It's on a 71 challenger

it's the last 6 of the VIN number (should have "B1" in front of it )

J?2??1B139671

Well what I had thought. But he said the numbers don't match the vin or build sheet(That does match vin) which is jh23g1

Pic is cut off but now ya mention it. Does look like b1 in front

It sounds like someone changed the VIN tag, as in rebody.

Just because the VIN tag and build sheet match doesn't mean that they belong on that body.

Yes this I know. What is crazy is the color and year of the challenger does match the build sheet

Build sheets can be from any car of the same model with usually the same color/type interior. My 71 Barracuda 318 had a 71 Cuda 383 build sheet in it... The 2 cars shared same interior/exterior color combination. Someone grabbed a seat that was heading for a different car.

My 1970 V code early SPD Charger R/T 4 speed car had two build sheets under the rear seat, the proper V code sheet and some other cars U code build sheet