As I am known (often beyond any due) as the local gun expert, one of my parent's neighbors brought this over for me to look at. I've done some research and learned the years A.G Parker changed corporate names and adopted various addresses. Ditto for Army and Navy CSL. I think I can date this rifle between 1920 and 1936 and it appears to bear a London proof mark. But I'm stumped much beyond that.

Any help you can offer is much appreciated!

I am going to attempt to post a few of pictures. More are available at my Flickr Page