This is the dozuki I went with: Crosscut Razorsaw, 240mm (9-7/16") (edited to add: looks like they dropped the red band on the handle on new models, it's the same saw though).
Japanese woodworking has an extraordinary tradition of complex joinery, known as sashimono woodworking. In order to execute sashimono construction (I cannot) the craftsman needs razor sharp tools, saws, chisels, and planes. Picture a hand saw; if you're picturing a western saw you're picturing one that cuts on the push stroke. Japanese hand saws cut on the pull stroke.
|I'm pulling the saw toward my body in order to effect the cut, rather than pushing away from my body|
I used a rip cut dozuki, a saw with teeth designed to cut along the length of a board rather than across it, to crosscut, it works, but it cuts raggedly through the grain and requires a great deal of sanding to clean up. The cross cut dozuki cuts so cleanly that almost no sanding is needed.
|Cut with a rip saw, not advised.|