Hey Eric,
Samitsu is not a smith that's lised anywhere, as far as I know. Your sword looks to be from around the date on the blade to me... and of good quality. Oei Morimitsu is said to commonly have gunome-choji hamon so... I think overall it has a fair chance of papering, but as Jean said, I'm just an amateur.
BTW- Eric, google bo-utsuri and see if you can see this kind of activity on your sword. Utsuri can be hard to spot if you don't know what to look for... but if you can see it, it would help authenticate it as Morimitsu...