Rock pin.

[painter777]

Hi Mike,
I had to pull the bolt apart to get this picture of my Type I firing pin.
These pics will show a Rock Ola Type I on the left and Type II on the right.
Like Bruce said...You can see a difference in the size of the ROCK OLA letters.
You'll also see on the Type II you have a taper or rise from the rear flat side of the pin to where it meets the round part of the pin.
Yours looks like the one on the right of mine (Type II).
Both show a punch mark on the left side.
Since I pulled the bolt down I pictured the Extractor marking for you also.

Hope this helps,
Cheers,
Charlie-painter777