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Bert H. said

I do not know or have an answer for your first question.  That stated, I highly suspect that the italic type marking was used after (later than) the block style marking.

In answer to your second question, that is an inspector’s stamp.  

Thanks Bert. I was getting confused about the block and italic mainly because the OP said his rifle was a 1913 and mine is a 1927. I did not understand how the italic could be before mine. But then you explained that his barrel had to be a replacement, so it all makes sense to me now. 

About the inspectors stamp? Were all of them marked that way? Also I suppose with that number you might be able to get a name of the person back then who actually inspected it?????That would be cool…

Steve