might be a nice blade and would like to see some pics from the blade
from Markus book:
but nor sure if these two smiths worked at the same time
SUKESADA (祐定), 3 rd gen., Kyōhō (享保, 1716-1736), Bizen – “Bizen no Kuni Osafune-jū Sukeada” (備前国長船住祐定), “Bizen no Kuni Osafune-jū Yokoyama Genpachirō Fujiwara Sukesada saku” (備前国長船住 横山源八郎藤原祐定作), “Bizen no Kuni Osafune-jū Yokoyama Genpachirō Sukesada” (備前国長船住 横山源八郎祐定), “Bizen no Kuni Osafune-jū Yokoyama Sukesada” (備前国長船住横山祐定), real name Yokoyama Genpachirō (横山源八郎) son of the 2nd gen. Gennoshin Sukesada, he died on the 27th day of the seventh month Kanpō three (寛保, 1743) at the young age of 32, gunome-chōji, suguha
SUKESADA (祐定), 6 th gen., Kanbun (寛文, 1661-1673), Bizen – “Bizen no Kuni Osafune-jū Yokoyama Kōzuke no Daijō Fujiwara Sukesada” (備前国長船住横山上野大掾藤原祐定), “Bishū Osafune-jūnin Yokoyama Kōzuke no Daijō Fujiwara Sukesada” (備州長船住人横山上野大掾藤原祐定), “Bizen no Kuni Osafune-jū Yokoyama Hanbei Fujiwara Sukeasada” (備前国長船住横山半兵衛藤原祐定), “Yokoyama Kōzuke no Daijō Fujiwara Sukesada – Bishū Osafune-jūnin” (横山上野大掾藤原祐定・備州長船住人), “Yokoyama Kōzuke no Daijō Fujiwara Sukesada” (横山上野大掾藤原祐定), real name Yokoyama Hanbei (横山半兵衛), son of Shichibei Sukesada, he counted himself as 6th gen. Yosōzaemon Sukesada, he received honorary title Kōzuke no Daijō on the eleventh day of the seventh month Kanbun four (1664), he died on the 29th day of the eleventh month Kyōhō six (享保, 1721) at the age of 89, together with his father he is considered as one of the shintō-era Sukesada smiths, narrow sugu-yakidashi, gunome-chōji-midare, kani-no[1]tsume, suguha, we know blades from Manji (万治, 1658-1661) to Shōtoku (正徳, 1711-1716) , jō-saku