Hello, new to the forums. Seeking some information on an Model 586 I recently acquired as part of a trade. The owner of my local gun store believes its a late 70's model and it has a Target Hammer, Trigger, and Sights but not Grips. There is no dash after the model number. There is a G10 etched near the serial and is only visible when the cylinder is open. I think this is the inspectors mark but am unsure. Looking for general knowledge and value. I can provide additional pictures upon request.