I'm helping a friend sell his Ruger Mark 1 with 6 and 7/8 inch barrel. It is in new looking condition except at the grip at the bottom of the takedown lever there is damage to the blueing about 1/32 wide by 1/4 inch long, like someone tried to force the takedown lever back into the grip. One magazine. Black eagle grip with feathers on the neck. 70,000-71,000 sn range.
What is the going rate for a pistol like this? Any ideas what year it is from? Best I can tell it is 1950's.

Thanks and happy holidays