W. M. Hawley, ed., Tsubas in Southern California (Los Angeles: Japanese Sword Club of Southern California, 1973), no. 417 [the first], no. 1306 [the second].
The name Seiryuken Tomohide was used by the third generation Tamagawa Yoshihisa from 1835. He worked for the daimyo of Mito in Hitachi Province. The present example represents his early work.