
It also



If you have an antique marking gauge, you may need to flatten the fence on a sheet of sandpaper. The fence on my antique gauge has two strips of brass that, when I bought it, stood proud of the wood, each to a different degree. One strip was about 1/32" proud, a

It could be that the gauge was made this way intentionally, with the brass not flush with the wood fence. But by relying on two thin pieces of brass to maintain a consistent distance between the fence and the edge of your workpiece, you risk making a wobbly line when you reach the end of your workpiece and one strip of brass is no longer in contact with its edge.
In short: a knife-edge and a flat face will improve your marksmanship.
Note added 3/12: in case you don't read comments, some readers are referring to Tage Frid's book that recommends filing a slight angle on the point so it will pull the gauge against the edge of the board.