ESP locking nut size

Updated
ESP locking nut size

I'm going to replace the locking nut on one of my '80s M1s and came across this issue.

The original nut has No. 2 stamped on it and most people thought these guitars from this era had R2 nuts but, after measuring, it seems to be closer to an R3.

I've had 3 of these (all identical) stamped ESPNO2 from '80s ESPs.

Does anyone know if this is actually an R3 and just happens to be marked as "No. 2)? 

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