I don't recommend using synthetic motor oil on rust blued guns. I actually use to use it to remove rust from badly rusted guns. It contains detergents. It is also hygroscopic and attracts water. Great for engines that are heated up but not for long term storage of guns.
There are several good posts on taking care of your gun, take the time to read them.
What exactly are you asking us for?
There is no way to trace the original owner, those records are not known at this time.
Have you examined the gun under the grips and in hidden areas for any markings?
Vern
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