Well I'll offer a few positives - and some stuff to check. An
L275 with 781 hours still has a lot of service life left. This early Kubota series was well-made and they tend to last a very long time with very few problems. If it really is in good original condition, it could be worth the asking price (maybe a little high for 2wd).
Some things to check - Pull both dipsticks (engine and gearcase) - oil should be uniform dark color, no white or spoapy specs, gearcase oil shoul be clean and translucent. Look for any signs of oil leakage - it would be unusual since these tractors generally did not leak anywhere. An oil leak may indicate more serious damage. Look at the air filter element, it is a cleanable cartridge. The housing has a differential pressure indicator that goes red if clogged. If the element is damaged or missing it can be a deal breaker. Check that the pto can be disengaged. I think the
L275 has a 2-stage clutch - partway down the travel clutch disengages - all the way down the pto clutch disengages. If the pedal linkage has been adjusted for travel clutch wear, it is possible the pto clutch will no longer release. This would mean a new travel clutch is needed.
Check that the hourmeter is working - these have a flexible shaft from the front of the engine which tends to break at the corner and stop working. If the hour meter is not functioning it's a sign of poor maintenance and/or higher hours than are showing.
Also, the paint on these tractors was not very weather-resistant. If it is shiny (and not repainted) that is a very good sign that it got reasonably good care. You can tell right away if a tractor has been repainted - lug nuts, alternator, starter, wiring, and most rubber hoses & clamps did NOT have paint on them originally. Have fun - hope this is useful. Dick B