Arirang Numismatics has published his detailed analysis of the Cupronickel Quarter-Yang coin of 1898. I know some here have collected these. Enjoy!
I have one of these Korea 1/4 Yang coins which I found in a 1960's coin dealer's foreign coin box. Korea 1/4 Yang 1898 (Year 2) Copper-nickel, 20.7 mm, 4.80 gm I believe that I have Arirang group E obverse 15 reverse 17.