I don't know. I won't open those little thumbnails.
The subject has been heavily covered on CT. Look in the posts and find dozens of posts on this.
I have two microscopes that I use everyday. Most of my day centers around cleaning ancient coins. You can't do that with a loupe. See my tools....
At this time I have 140 attributed and photographed ancient coins. All of these are coins that I cleaned and identified, many times with help from...
I think you got them from my bank. All of their pennies look like that.
Separate names with a comma.