Q236.  Iron with brass, Heianjo Zogan maybe.  7.8 x 8.4 x .35 cm.  The nakago hitsu-ana is .8 x 2.7 cm.  The Manji is an ancient Budhist symbol; it has nothing to do with Germany & WWII.  There is some loss of brass but this may be a bit older than the usual brass zogan tsuba and is to be expected.  There are subtle tekkotsu on the rim.  $295.