Black Bands on Barrel and receiver

[EddieB]

I just recently purchased an Winchester 1917 and when I was disassembling it for a cleaning before shooting it for the first time I noted that there appeared to be some black paint on the barrel and the receiver. I have never heard of this and figured I would post some pics to see if anyone here knows anything about it. There also was a marking on the barrel that I have included to see if that helps. Thanks.

[jamie5070]

I am not sure what caused the marking on the barrel, but the receiver shows the heat treatment.
John

[browningautorifle]

I am not sure what caused the marking on the barrel

Those look like the shape of the front band being left on during refinishing (parkerizing)...