Thanks to
elgringo14, now here are a few additions for the missing Japanese animations. Bear in mind, though, that they are pre-Tezuka, and the best place to find them is not on P2P, but over the net since they no longer have a copyright and they are mostly historical curiosities. I have only included those that are known to exist, as there are a few other from 1917 which may be lost forever.
1917;
Hanawa Hekonai Kappa Matsuri (塙凹内かっぱまつり)
http://anidb.net/a6965
1917-06-30;
Namakura Gatana: Hanawa Hekonai Meitou no Maki (塙凹内名刀之巻(なまくら刀))
http://anidb.net/a5862
1917-07-28;
Itazura Post (いたずらポスト)
http://anidb.net/a6913
1917-08-11;
Chamebou Kuukijuu no Maki (茶目坊空気銃の巻)
http://anidb.net/a6964
1917-08-26;
Hanasaka Jijii (花咲爺)
http://anidb.net/a5385
Almost all pre-1950s animations don't have a known rip, although to be fair, some of them are easily found even in Youtube. Should they be included in the list? I don't think they would be interesting to everyone. And I have yet to add the ones from 1918 onward.