M-22 Vin stamp question?

[Pantera]

Here is a M-22 trans vin stamping. I can make out the "N" and a few numbers but am not sure just what it came out of?

You guys love to decode these things so here you go.

[Pantera]

here is a different angle.

I notice that the last pic shows the square edge of the tool that held the stamps. I have had this under the work bench for a lot of years.

[Pantera]

Last one

[DarrenX33]

Boy that's a tough one Larry. 11N388844?

[Charley Lillard]

The "B" to me means M21.........

[Kurt S]

71 Camaro 11N55xx44, I'd guess 6 and 8 are the middle digits.
P1A14B - M21, built Jan 14, 1971
Had to be a hipo car, probably a Z, to get an M21.

[DarrenX33]

Good eyes Kurt. How bout this? 11N536544

Really looks like a 3 after the 5.

[Kurt S]

Yup, I agree with your guess more than mine.

[hugger_69]

Look to me like 556544

[Pantera]

That number is more like what I was thinking it was.. I had forgoten that the grove in the input shaft must make it a M-21.

I was puzzled by the 11 in front of the "N". I could see the 1 next to it as 1971. The extra 1 is usually not on a trany vin stamping?