Once again I need to tap into the vast knowledge of our members. I'm fairly new to the straight razor world. I just received a Boker 2656 I purchased on Ebay. When I finished cleaning the blade there was still a thin line, "hair line", about a 1/2 inch long and about center line of the blade. It starts at the tip of the blade. I thought for sure the blade hard a crack in it but when I look at it with a 100 mag I still see metal in the line. It just appears the polished finish has deteriorated. Is this a crack or worn finish (pitting) due to the stain? is there any repair for it? Thanks