I feel like I am rewarding this coin both for its relatively young age and the fact that you just don't see green on modern toned proof Jefferson Nickels. 5.25
Green is rare on proof Jeffs. The 70s ones sometimes get it from mint packaging, just like the 60-68 ones.
I'm at at 4.9 The Norwegian coin is still in play too since there have not been many replies on it yet.
3.0 on the 100Kr. Lack of other colors keeps it low IMO 5.5 on the 71S Proof Nickel I like multi colored toning on proof coins, especially when it's on both sides.
The 1971s Jefferson is beautiful in hand. My son gave it to me last Christmas. I agree with a consensus in the 5s. So, I will rate it as 5.3. Very tough to get a monster on a Jefferson nickel, for numerous reasons, especially a proof, as opposed to business strike.
I am going a little lower on this one. Kennedy's tone up pretty good in mint state, and this one while nice probably has a very dark appearance in hand unless it is flooded with light on the surfaces. 3.5
I'll update the other rounds at a later point. I'm going with a 4.0....the spot on the neck hurts a little @Lehigh96 this is a proof (which makes your point stronger)