The gold metal flake is seriously awesome !
My first impulse would be to say that its not a true track bike, but a fixed gear trainer. (brakes, QR front wheel, clincher tires, doesnt look like a 144 bcd crankset ) - however, i suppose someone could've drilled the fork crown and rear brake bridge at some point in this machine's history to do that -- likely an export bike despite the NJS markings , as Japanese track guys' are usually pretty short and compact
I have seen those rudimentary brake levers used on Japanese trainers before in photos. For max value, id remove the brake setup and photograph it without it and ask $600 with the caveat that it is drilled for brakes, but it goes without saying that to get max value, it would need to be cleaned up and with the bearings serviced ideally, some new tires and raise the saddle about 3-4 inches (after tucking the loose vinyl back up with some adhesive -- its a Matsuri logo saddle so may be worth keeping it with the bike
Between a bike designed for someone 6'3 to 6'5 may limit the audience for it a bit, but then again , some tall dude may be out there looking for something similar and say "Eureka! I found one ! "