$600 could be a bargain price if:
Blade is in good condition with no sign of being cleaned or messed with.
Motto and maker mark is intact and nice cross grain still remain along the blade,
Handle is free from cracks, chips, and cross guards to handle fits nice.
Scabbard condition is as good as u remember and dagger to scabbard fits nice.
If so u will probably have a sweet dagger to a very good price
Sam,
