: The "720" designation was a standard high-definition benchmark during its 2013 release, offering a balance between file size and visual clarity that remains viewable on modern devices.
: Many hobbyist collectors or specialty websites use this exact naming convention (Series + Date + Name + Resolution) to organize large libraries of media. 1000giri 130614 Keiko 720
: This could refer to a number of things, such as a measurement, a time (7:20), a model number, or a specification. : The "720" designation was a standard high-definition
This is a timestamp. Following the standard YY/MM/DD format, this indicates the content was originally released or uploaded on June 14, 2013 . such as a measurement