Tough sell, dude, because it's not a real commercial slot machine. Some guys like those skill stop games though. Good luck.

It is a Japanese Pachislo.
NorCalCollector is wrong, these are commercial grade machines.
In Japan, gambling is illegal, so they designed these as a "game of skill" due to the manual "skill stop" of the reels.
It's still just a slot machine but much more fun and interactive. They have huge parlors of these over in Japan. The tokens are also how they get around the gambling since it's not "real money" but you take them to different businesses and trade them for goods similar to redemption games, but for real money and items, not cheap plastic junk.

Pachislos are worth about $100-250 they are fairly common and most of them are pretty simple. There is a collector website for these, just google Pachislo. The new models of the past ~10 years have LCDs and animated overlays and stuff, those are worth big bucks! This is probably worth in the range I mentioned.

Good luck with the sale!