Iron tsuba signed "Sei Issai". I could not find any information about this maker, however his work is similar to Tanaka School style. I could not find any more information about him other than that there is one more of his tsuba on sale right now. It is a tsuba with Tokubetsu Hozon tosogu sold at Touken Matsumoto:
Tsuba is decorted with silver and gold nunome zogan, silver and gold inlay and gilded elements. There are many small scratches on the surface.
Made in late edo period.
Size: 68 mm x 60 mm x 4 mm