hi katana,
nice blade, mine is without the inset dots, and does not have fullers and has a flat spine, but the spine grooves and inlays are very similar. mine has (from hilt) 2grooves, brass inlay, three grooves, 1.5in gap, 2 grooves, 1.5 in gap, 3 grooves, brass inlay, three grooves, 1 in. gap, 4 grooves.
looks like half your grips rattan rings are missing, they will be fun to replace. if you are not into rattan work, braided string wrapped around & oil varnished could look very similar without being permanent. blade could be re-set into the hilt with cutlers cement (or resin) (
Linky ) or pitch, y'all could use nepali laha which is pine rosin, some nice powdered dry dung (for the fibre content) and can be easily heated for removal/re-installation - smells wonderful when heated
. depends on how far you want to go. you could of course give it a light clean & oiling/waxing & leave it alone.