Tracking down Antique Coins in Resident Evil Requiem will let you purchase upgrades for Grace in the West Wing Parlor, once you open up the unicorn door blocking it. There are 20 coins scattered around, which is more than you'll even need to purchase every upgrade available, including a Hip Pouch to expand her teeny tiny inventory—something you'll definitely want as early as possible.
Since coins stop being useful after you leave the Care Center, you'll want to spend them while you can. All that said, here are all of the Antique Coin locations in Resident Evil Requiem.
