TF31 MACO Quartermaster – MACO Challenge Coins MACO UNIT CHALLENGE COINS USS Helen Pawlowski Chapter/MACO Challenge CoinDescription: 1.75″ double sided challenge coin.Cost: $10.00 each.Station Robert De Bruce Chapter/MACO Challenge CoinDescription: 1.75″ double sided challenge coin.Cost: $10.00 each. Like this:Like Loading...