sword forge dates

Classical Japan (538 - 1185 CE)
8th Century - Kogarasumaru

Heian (794 - 1185 CE)
982 - Ishikirimaru
987 - Uguisumaru
989 - Imanotsurugi
? - Iwatooshi
989 - Kogitsunemaru
989 - Mikazuki Munechika
? - Higekiri
? - Hizamaru
1053 - Tsurumaru Kuninaga
1151 - Shishiou
? - Oodenta Mitsuyo
? - Sohayanotsurugi
? - Ookanehira

Kamakura (1185 - 1333 CE)
1207 - Nikkari Aoe
? - Juzumaru Tsunetsugu
1238 - Shoukudaikiri Mitsutada
? - Azuki Nagamitsu
1259 - Ichigo Hitofuri
1259 - Namazuo Toushirou
1259 - Honebami Touchirou
1259 - Hirano Toushirou
1259 - Atsushi Toushirou
1259 - Maeda Toushirou
1259 - Akita Toushirou
1259 - Hakata Toushirou
1259 - Midare Toushirou
? - Nakigitsune
? - Gotou Toushirou
? - Shinano Toushirou
? - Gokotai
? - Yagen Toushirou
? - Houchou Toushirou
? - Mouri Toushirou
1278 - Aizen Kunitoshi
1297 - Hotarumaru
? - Akashi Kuniyuki
1312 - Heshikiri Hasebe
1322 - Koryuu Kagemitsu
1323 - Kenshin Kagemitsu
? - Monoyoshi Sadamune
? - Taikogane Sadamune
? - Kikkou Sadamune
? - Fudou Yukimitsu

Kenmu Restoration (1333 - 1336 CE)
1334 - Kousetsu Samonji
1334 - Souza Samonji
1334 - Sayo Samonji
1335 - Jiroutachi
? - Kotegiri Gou

Muromachi (1336 - 1573 CE)
1350 - Ookurikara
1394 - Taroutachi
1505 - Kasen Kanesada
1513 - Sengo Muramasa
? - Nihongou
1531-1631 - Horikawa Kunihiro
1532 - Tonbokiri
1570 - Otegine

Azuchi-Momoyama (1573 - 1603 CE)
1584 - Yamabushi Kunihiro
1590 - Yamanbagiri Kunihiro
1593 - Doudanuki Masakuni

Edo (1603 - 1868 CE)
1655 - Yamatonokami Yasusada
1660 - Urashima Kotetsu
1665 - Hachisuka Kotetsu
1684 - Kashuu Kiyomitsu
1688 - Mutsunokami Yoshiyuki
1844 - Nagasone Kotetsu
1867 - Izuminokami Kanesada
? - Tomoegata Naginata