hi guy
these are better pictures yes these pictures do look like the blade is longer ok then over 29 inches nothing that you can see like a showa mark or seki arsenial mark this would be marked by the back side of the habaki just pull back the habaki and inspect both sides of blade tang where the habaki sits if there is no marks then i would say your blade is from late 1700s possibly early 1800s hope this helps you best i can see have a great day andy militarynut