You might as well bondo if you're going to fix it.

Gloss black for Williams/Bally cabinets

Rustolium is pretty good. That's what I use for touch ups.

I would think it needs to be spray paint. You dont want brush strokes

That should work fine. A brush would work for that small area but you can spray it also if you like. If you do a decent job sanding and don't glob the paint on there then it will turn out fine. Its on the top of the cabinet with no artwork on it so it will be difficult to mess it up.

It looks like the front doesn't have as much damage as the top. It appears like just the edge needs to be repaired.

It really wont be noticeable. Better than the way it is.

Learn from the master. https://pinside.com/pinball/forum/topic/cabinet-restoration-vids-guide

Not trying to be argumentative, but I'm pretty sure it's satin black, not gloss black. You can buy spray rust oleum with the primer included, this works really well for small areas like you have if you end up taking it down to the bare wood

I would try and match the paint best you can if you don't want to paint the whole thing. You could take a chip of paint where you are going to bondo to sherwin Williams

I'm surprised no one else has commented. But I have done full cabinet restorations and small touch ups on B/W cabinets and I have always used satin black. To me it blends quite well. I would not brush paint with a regular brush, you will definitely see the strokes with black paint. For most areas I spray and just hold a piece of cardboard over the area(s) I need to protect. Cover the Playfield glass with something so paint will not settle on it from the air.
For really small areas you can spray one of those small foam brushes and use that to apply the paint and it will blend well.

I just did touch up on the front of a TOM that I picked up a few weeks ago, used the small foam brush with a little of the rustoleum satin black sprayed on the brush. You cannot see the freshly painted area.

After coming home and looking over a few of my cabinets - its Satin. Listen, youre not going to screw up painting a part of the cabinet maybe a few people will ever notice. Its one color that you don't even have to match. You cant really mess it up except for the filling/sanding. If its not the right sheen then go glossy.