Winchester barrel question

[Wdalew5 Find all posts View Profile Close Wdalew5]

This is a winchester barrel dated 5/67. Its is near perfect condiction . Any idea what these tool marks or lines are in the barrel?

[RCS Advanced Collector Find all posts View Profile Close RCS]

Could have been done to deface import stamp

[Can14 Find all posts View Profile Close Can14]

I think RCS is right. I have seen a few 1967 barreled rifle here in Canada , they are the same as any other