[ Reiner takes the coin in hand, aware that he's likely never held anything with so much monetary value before. He himself is valuable, of course, his Titan one of Marley's greatest weapons. His ODM gear is likely valuable as well, but Reiner suspects its value lies in information rather than money.

But gold? That's a different beast entirely. ]

If this is real, it could be incredibly useful. Jewelers and artisans would have a ready supply of gold; they wouldn't have to risk mining. [ He assumes that's how they get gold here, anyway. ] I wouldn't be surprised if it's also a required ingredient in some potions and spells.

[ He flips the coin back to Sun, meeting his eyes with a smile. ]

You could help a lot of people with this.