What is this tool?

[Cue]

Came in a old toolbox full of rusty stuff, I blasted it and was wondering what it may be? It has some sort of pointer riveted on and it rotates. I was thinking it was some sort of scribe?

 

[mashguy4077]

It looks like a deburring tool for pipes.

 

[demarpaint]

It looks like a deburring tool for pipes.

Yes, it looks like it might work well for removing old tile grout too.

 

[Al Borland]

Follower for a pattern lathe?