Early 1980s
Depending on condition, blued or stanless, type barrel, type sights (which I can't tell from the serial number), about $150 for a well worn basic model, to $375 for excellent, target barrel and sights.
$100-$225, depending on condition, barrel sights, etc.
Depends on the condition, type of barrel and sights, etc. Anywhere from $200-$500.
Fixed sights, adjustable sights, target sight, night sights, 3 dot sights, telescopic sights, red dot sighs, lasers, etc.
Depends on model, barrel/sights, and condition. Anywhere from $100 for a well used Mk1 to $400 for a NIB stainless heavy barreled Mk II with target sights.
To pinpoint the target.
Will depend on the exact model, barrel, sights, and condition. A well used Standard Automatic with basic barrel and sights might sell for $100, a higher end Mk II with extended heavy fluted bbl and target sights $350.
Assuming you mean a Ruger Mk II, it will depend on condition, barrel, sights, etc, but probably $150-$275.
You are focusing on the sights and not the target.
50-180 USD
In this forum's context, Smith and Wesson, Target Sights.
Most aftermarket sights are fiberoptic types such as Williams FireSights or the Tru-Glo sights. I dont know of any specific target applications.