Coin Grading is great for both authentication and sight unseen selling.
If its a coin that others desire and its not made of gold the chances are its a “Standard” tier coin.
Is your coin valued at over £250 and under £2,500 and is it made of anything but gold - yes even Platinum, Palladium and Silver? In that case you fall into the standard grade tier. Nobody likes to be called standard but in the case of coins they love it as it means they are so much nicer than those called “Economy”
A great high value 1934 crown. Sometimes these can sneak into Standard Tier and sometimes they get elevated to a more expensive tier.
One of the most beautiful British coins ever. A moderate one will be in "standard" tier but many will be in Express or Walkthrough tiers due to their high value.
Many silver hammered coins come in the Standard tier since good ones are in the £1000 to £2000 range much of the time. This one has variety plus that adds the Spink number and weight (+£6)
Many VIP proofs and Proofs of Record come in Standard Tier. You will not often see NGC use the word VIP though these rare coins often are.
We all recognise the brass 3d but only a small handful of these beautiful VIP proofs are known.
Many world rare proofs are graded in Standard Grade including this lovely and extremely rare 1952 Burma proof