Ryumin in use

Developed in the 1960s to meet the demand for a unique Mincho typeface designed specifically for phototypesetting. Based on the No. 4 size (approximately 14 points) of a metal Mincho typeface by Morikawa Ryubundo. The name is a portmanteau of Ryubundo and Mincho. A first test character set wa completed in 1971 and a second one in 1977. The original L weight was designed by Terasu Mori. Masahiko Kozuka led the family expansion. [Morisawa]

Comes in eight weights. The sample shows the Regular (R-KL). The Light (L-KL) is available from Typekit. The thinnest weight was released in 1982. [ryougetsu.net]