Thanks for your answer and insights. I do have a Type 97 with twin Ashi saya in my collection, but considering adding another with single Ashi saya if other characteristics are satisfactory/desirable. My main concern was avoiding the purchase of a Type 97 with single Ashi saya if they didn't exist. Also, was Shark skin commonly utilized on Tsukas of the Type 97's? If so, were more produced with Ray skin vs Shark skin, or vice-versa? I am aware that lacquered black canvas was utilized for Type 97 Tsukas late in the war. Finally, I did purchase a copy of Dawson's Cyclopedia and Kapp & Monson's "Modern Japanese Swords" (considering purchasing Fuller's book, as well), and I've been doing a lot of reading and researching since I got into this hobby a few months ago. I feel like my brain is exploding with information over-load. Lol!