Under the old system, one jīn equals sixteen liǎng.
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history
Historically 旧制 often refers specifically to pre-1959 Chinese measures, when 1 斤 (jīn) = 16 两 (liǎng). The PRC's 1959 metric reform (市制改革) redefined 斤 to 10 两 = 500 g, which is still called 市制 (shìzhì) — the system in everyday use today.