Item description here:

This sword has been fully restored and is in a fresh sashikomi polish.  The workmanship in this katana is excellent and the hamon is very active and beutiful.  The sword has no flaws and is in interesting mounts that are in a waves and crabs motif.  The tsukamaki silk is brown and the saya has stone texture.  The sword is not signed, however the NTHK attribution is to 1st Generation Katsukuni.  

KATSUKUNI (勝国), 1st gen., Kanbun (寛文, 1661-1673), Kaga – “Kashū-jū Fujiwara Ieshige saku” (加州住藤原家重作), “Kashū-jū Iyo no Daijō Darani Tachibana Katsukuni” (加州住伊予大掾陀羅尼橘勝国), “Iyo no Daijō Tachibana Katsukuni saku” (伊予大橘勝国作), second son of the 1st gen. Ieshige (家重), real name Matsuto Zenzaburō (松戸善三郎), in Kanbun one (寛文, 1661), he received through the agency of his employer, the Maeda family (前田), from chancellor Yotsuji Yoshiie (四辻吉家) the honorary title Iyo no Daijō (伊予大掾), the clan name Fujiwara used by him so far was changed with this to Tachibana (橘) and the smith name to Katsukuni (勝国), with this he was the 1st gen. Darani Katsukuni but counted himself also as 17th gen. Rai Kuniyoshi (来国吉), he died in the twelfth year of Kanbun (寛文, 1672), itame mixed with masame and a Kanemoto-like sanbonsugi, the interpretations of Ieshige/Katsukuni are insofar different from that of Kanemoto as that they show nie in the valleys between the sanbonsugi elements, kata-sujikai yasurime, jō-saku