Glass can have a melting or transition temperature lower than 1,000C.
They look genuine enough.
Different glass compositions melt at different temperatures.
Coins that are exposed to relatively small amounts of air and that are stored in relatively dry environments will tone substantially more slowly...
Sounds good to me.
The surfaces do not look natural.
Nitrogen will not react with metals, but there is absolutely no utility in storing coins in liquid nitrogen since you would scarcely ever be able...
Unfortunately, these have been cleaned, too.:(
The color is absolutely wrong for coins with this amount of wear.
I like your response of marketing gimmick, but think your reasoning for avoiding slabbed coins might leave quite a bit to be desired.
Even though they have already been cleaned to all heck and back, I still would not suggest attacking the surfaces with a tooth brush.
Looks like a business strike 1969-S to me.
That is a very old edition of Overton. It looks like the O.114, which is an R3.
I'll be set up at both shows for the duration.
The coin is common as dirt even though it is considered a key date. It is easy to buy one of these that has no problems for little more than what...
A good grading guide would be The Official American Numismatic Association Grading Standards for United States Coins. The sixth or seventh...
Have one or more knowledgeable folks whom you trust inspect the coins with the goal to be picking out those that might benefit from certification....
It could be the lighting, but the color looks artificial.
I've been in this business a long time and can tell you that in the last fifteen years the market has slanted heavily toward favoring PCGS for...
In general, it means a coin sealed in a third-party graded holder.
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