quote from Usagiya
"KISSAKI-MOROHA-ZUKURI
The forward part of the blade is double edged. an example: sword19
A curved blade type is especially called "Kogarasu-maru" style.
"Kogarasu-maru" is a name of one very famous sword in curved kissaki-moroha-zukuri.
It was a treasure of the Taira ...
