Those percentages take in account the impurities in the Nickel. 99.9% has .1% impurities.
The 1983 has 1% or less impurities. It is the same with gold or silver bullion coins. They are always 99.99% pure.
You never see them stating 100% pure.

All the Nickel Dollars from 1968 to 1987 were 100% nickel.
As to the answer to your original question, I don't really know.

I thought that may be the set. That is an aftermarket set in a Capitol coin holder. There are some for sale on eBay in fact there is one with all 5 varieties. I don't believe they are PL Dollars but Business Strikes. If it was assembled by the RCM, it would have their logo on it somewhere. I have no...

I assume that you are talking about the Silver Dollar varieties (there are actually 5). Sounds to me like it may be an aftermarket set as I don't know of any variety set being released by the RCMs plus they did not use clear plastic cases back then. Pictures would be a great help to determine what y...

There are only two in Canada that I know of, BCS as mentioned and CCCS canadiancoincertificationservice.com in Quebec There is nothing out West.

Probably taken a hit that has slightly flattened it.
Pretty sure it didn't look like that when the coin was struck.

It is not unusual to have a gap between the outer ring and the core. There are some out there that have a gap large enough that you can see through it. These usually bring a premium.

Looks like a plating bubble trapped between the brass plating and core.

Agree with Bill
Devices are reduced with a shelf like appearance which equals MD

That is the near variety

Not an error, some sort of damage. Possibly acid as you suggested.

FYI-
It is only an error if it happens during the striking of the coin. Anything that happens to the coin after that is considered damage.

Don't really see anything outstanding and because of the condition, most of the silver coins except for the 1907 quarter wouldn't be worth much over bullion . The quarter might be worth 5-6 dollars. The cent and the nickels might be worth 25-30 cents each. The problem is if you are trying to sell th...

Agree with Bill
I don't t really see anything that stands out in the pictures supplied. Most look like they are worth face value. If you have something you think is worth more, post separate photos of both sides and what your selling price is.

Well I must be from an older school, (maybe not that older) you wouldn't t call a 1910 silver 5 cent coin a nickel.
The terminology nickel came about to distinguish a silver 5 cent coin from one made of nickel hence the knickname.

If you want local pickup, it might help if you stated where you live. Also there is no such thing as a silver nickel.
It is either a silver five cents or a nickel five cents which is 1922 or later.