basic question on weighting

smallchange

I did a search and cannot seem to figure out my question. In a basic date set, are different weightings given to different mintmarks. I am planning on trying a mercury dime date set and don't understand the weightings. Is it all based on grade or does mintmark play a part. I understand the deductions or bonuses for full bands etc. but this weighting thing has got me confused. Thanks for any help to this new guy.

small change

sonoranmonsoon

Carson City coins ussually weigh more because they have to add 2 letters to the coin, instead of one or none.

19Lyds

From the Registry Help page:

What are weights? Within a set, not all coins have the same value and rarity. Sets in the PCGS Set Registry are weighted on a 1 to 10 scale with 10 being the rarest coin and 1 being the most common. While it may be in true in some instances that a coin may be many times over 10 as rare as the most common coin in the set, the Registry keeps the scale simple so that all levels of collectors can compete.

The Registry weighting is done by taking three things into account:

1. The overall rarity of the coin, i.e. the rarity in all grades

2. The rarity in the highest 2 or 3 grades

3. The price (because this is an indication of demand and importance to collectors)

Why are some sets not weighted? Sets may be added without weights so that collectors may begin adding their coins. Eventually, all sets will be weighted.

LoveMyLiberty

smallchange PM sent to you.

Silverstate

So what would weighting look like in the Presidential Sets.

Take the Washington P - pos A & B, in MS67 they are rare & expensive.
Yet, in MS66 they are common.

Wouldn't this be a average weighting on this coin, since it is more common than rare.
Since, only the MS67 has a conditional rarity only.