Number + 枚 + Noun
The classifier 枚 (méi) is used to count small, flat, or coin-like objects such as medals, stamps, coins, and badges. It is the standard measure word for these items in formal Chinese. For example, 一枚奖章 means "one medal."
爷爷珍藏着两枚抗战时期的纪念币。
yéye zhēncáng zhe liǎng méi kàngzhàn shíqī de jìniànbì.
Grandpa keeps two commemorative coins from the Anti-Japanese War era.
她在比赛中赢得了一枚金牌。
tā zài bǐsài zhōng yíngdé le yì méi jīnpái.
She won a gold medal in the competition.
我在旧货市场淘到了几枚清代的铜钱。
wǒ zài jiùhuò shìchǎng táo dào le jǐ méi Qīngdài de tóngqián.
I found a few Qing Dynasty copper coins at the flea market.