noun
reeded-edge 10 yen coin
Historical colloquial term for the 10 yen coin with a milled edge, minted from 1951 to 1958. Now a collector's item, but the nickname is still recognized.
See also: ギザギザ
ギザ十は今では珍しい硬貨だ。
The reeded-edge 10 yen coin is a rare coin nowadays.
祖父がギザ十を何枚か持
My grandfather has a few reeded-edge 10 yen coins.