Are these Navy buttons Civil War era?

[fwf1066]

I recently bought these Navy buttons at an auction. I don't have a button book, so can someone tell me if these are Civil War era buttons? The top one is back marked "Superior Quality", the middle one is back marked "Extra Quality" and the bottom one is not back marked.

 

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[Bigcypresshunter]

The top two were still made after WWII and it is hard to find a link that puts an exact date on these modern buttons. Are they steel back? I think a picture of the backs would help. I would say not CW but could be WWI or WWII.
http://forum.treasurenet.com/index.php/topic,209855.0.html

I dont know about the bottom one.

 

[fwf1066]

Here are the backs.