Help decipher Dana M186 pinion numbers

[sstuner]

I installed a Torqlocker yesterday in my 2018 JLUS Dana M186 front. While I had it apart I took a photo of the pinion and it had numbers etched on them. Hopefully the attached photo is good enough to see etch. Can someone help in deciphering.

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[sstuner]

Here is a photo of the TorqLocker locker installed in the M186..

 

[6.2Blazer]

What do you want to know?

 

[sstuner]

I would like to find out what the etching signifies:

Circle w/C?
4NO(letter O) or 4N0(zero)?
.0737?

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