guān jīn quàn shì Mínguó shí qī hǎi guān shǐ yòng de zhuān yòng huò bì, xiàn zài yǐ jīng tíng zhǐ liú tōng le.

关金券是民国时期海关使用的专用货币，现在已经停止流通了。

The customs gold unit was a special currency used by Chinese customs during the Republic of China era and is no longer in circulation.