Button help please..

[Kam in MN]

I was going through my deceased Father-in-law's metal detecting finds and came across several buttons.
How old, are they authentic, what are they??

Any help would be appreciated. I thought that the people who frequent this forum may be able to help with the questions.

The first photo is a flat button but it looks as if a loop may have been attached at one time. (57S)
The next photo looks to be two Navy buttons, they have anchors on them.
The eagle insignia looks to be very old because of the shape of the eagle's head.
The crusty eagle also had a loop at one time.
The two buttons with the crowns were found in two different locations but one is smaller than the other.

Thank you in advance,
Kam

[rcbob166]

Place a post on the What is It forum and you should get an answer right quick.
Later,
Robert