Dwight,
I did look at the breechblock again.
Well, maybe the one above is different, but the lower one appears consistent with the other e/2's on the pistol.
Here is a picture with the receiver and breechblock.
In size and appearance, the upper stamp is similar to the center receiver stamp. What do you think?
Now I get the thumbnail. Yup, that's what it looks like - may not photograph that well, so I tried some sunlight.
Here was a missing inspection stamp photo
I'll try some better tool pictures, and closer examination later.
Thanks and Regards,
Fritz.