[jeffjmr]

Thanks all for your helpful responses.

Here are some more pics that answer some of your questions.

I am curious about the barrel; it's patina matches the rest of the gun perfectly, and the witness mark sure looks like it was made in one stroke. I don't see the E/33 but the eagle with a 33 is shown in one of the pictures below.

Looks like a cursive "n" below the frame s/n.

I am not sure about the mag safety as I have never seen one before this one. Where would the "clip" be evident? Is there supposed to be a part that protrudes into the frame hole near the top?

Thanks again.