Kc57. I'm not sure if you know this but this bike you found is super rare. In 1969 when bonanza switched to the mid peg model frame they also switched their hodaka modal bonanza from a bc1300sh to a bc1500sh with movable handlebars a slightly different rake and a top mounted fiberglass tank. There really is no advertisements or any known mid peg bc1300sh bike except for some rare photographs at the bonanza factory that showed a row of mid peg bc1300sh models with rare Goodyear tires. I'm not sure if bonanza made a handful of these before they switched or what the story actually is but I would like to find out. A friend of mine who is a big bonanza collector showed me the photos last year. Congratulations on your find and I would carefully document everything on the bike and take lots of photos and if you restore it please take your time and do it right.