G'day there, just another MKIII* here and I have some questions about barrel markings.

Attachment 89472Attachment 89473Attachment 89474Attachment 89475

Ok so starting at picture 1: 'P' and '955'. I have no idea what these mean. Could '955' mean '1955', such as an inspection date or something?
Picture 2: All the crowned markings are government proofs or something? The two lower markings with the arrow above them I assume are manufacturing markings? The '17' is the barrel date? Since the barrel date and receiver date, and barrel number and receiver number also match, then that means this is the original barrel that the rifle came with in 1917?
Picture 3: More government proofs?
Picture 4: Receiver and Barrel match, more government markings? The two 'G's I have no idea about, and the same goes for the '3' above '83370'. '83370' on the receiver, could that be a rack number? It is also marked on the butt-stock. Finally the crown over the 'B' right at the base of the barrel is a government marking?
Final thing that I have not pictured is an arrow with a star at its tip right on top of the barrel; this means there has been rust in the barrel at some point, or on the outside? There is plenty of pitting on the outside of the barrel, but the inside is smooth as anything.

There are probably dozens of more subtle markings on the barrel and around the receiver but I'll leave them out for now. I took pictures and notes of absolutely every tiny marking I could possibly find all over the rifle, so if you think there is a marking that will help with ID then I guarantee I have a picture or at least notes on it.

Bit of a drawn out post, but I hope you have the time to read it. Thanks.
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