Band brake drum looks wrong

[Tu tony]

Are band brake drums suppose to be slightly flared out? And mine has a slight dip or sag in the middle part that grips the brake band

 

[Rat]

It looks normal to me, I've got a brand new one that I never installed, and it has a faint dip. It's just to encourage the band to remain centered when the brake is applied.
You do have a bit of a wear path though , but not significant enough to even call it worn.

 

[Denny]

Rat is right, helps center the band.