Right-hander Darren O’Day (hyperextended right elbow) continues to progress slowly. Showalter said that he will need at least one or two rehab games before being activated. … Outfield prospect Cedric Mullins was promoted to Norfolk from Bowie. He was hitting .313/.362/.512 with 23 extra-base hits (12 doubles, five triples, six homers) in 49 games with the Baysox. … Pitching prospect Hunter Harvey was scheduled to be shortened up to pitch just three innings for Bowie on Friday, but he lasted just two, allowing six runs on five hits and a walk, including two homers. … Baseball Treasure, a company that mints officially licensed collectible copper coins featuring 30 current baseball stars, has announced the introduction of collectible baseball trading coins in copper, silver and gold. A star from every major league team has been minted in a one-ounce copper coin presented in a full color cardboard mount with center fielder Adam Jones representing the Orioles. The packs, which are the same size as standard trading cards, retail at $6.95 each. In addition to the 30-coin copper base set for 2018 Baseball Treasure MLB Coins, collectors can also hope for the rare chase coins. The odds of obtaining a .999 fine silver version (a $50 retail value) is one in 432, while the chances of getting a gold coin (a $2,000 retail value) is one in 21,600.