No
50-250 USD or so
100-560 USD or so
I am betting you Ruger if it is in good condition could go for $250 to $300.
0-400 usd
300 or so
100-400 USD depending on condition.
100-1000 depending on specifics
The 50th anniversary edition pistols really haven't attained that much value, given that they aren't particularly uncommon. A basic, blued Mk II with the standard profile barrel can be found new in the box in the $200 - $300 price range, and the value would be substantially less for a pistol which has been fired. You probably won't see much of an increase in value of the 50th anniversary pistols at least until Ruger marks its 100th anniversary.
50th wedding anniversary is Gold23rd wedding anniversary is Silver Plate
100-400 usd
Yes, today is the 50th anniversary of the Flintstones.
Nascar celebrated its 50th Anniversary in 1998.