Urashima Tarou (1931)

Both are short movies adapting well known Japanese folk tales. Urashima Tarou adapts adapts Urashima Tarou legend, Nihonichi Momotarou adapts legend of Momotarou (obviously). Both are black and white anime from 1930 era. 

This was one of the first "historical" (history-based) animations ever done, and it goes all back to 1931, and there's a first version from the end of the 1910's decade, I just can not find it anywhere to watch... If you ever wondered how the anime industry got to be this way, and actually have the oportuinity to watch Rurouni Kenshin, please go to YouTube and watch Urashima Tarou, it's only 2 minutes long.