✅ SOLVED Any button experts have any opinion?

[WHADIFIND]

I found this button at an old mansion that has a very long history. Even to the colonial days.
It's a flat button, about 2 cm in diameter, nonmagnetic but that's about my limit of knowledge on them.

When I attempted to straighten the one bent edge a bit, I figured it would be absolutely fragile!
But, this thing is very, very strong for a button that I supposed had been in the ground for hundreds of years!
Is pewter really, really tough?

Anyway, I wouldn't even bother trying to further ID this except that I'm trying to pin down the time frame of this section.
And, I'm not sure, but I could almost swear I'm seeing something that looks like an eagle on the back. I really don't know buttons
but I'm hoping that someone out there could check and first of all, tell me if my eyes are just gone. Then, if not, if they'd
know of any backmark with an eagle?

Thanks in advance and happy new year!

Here's the pics:

 

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[osage express]

I see it too It looks to me to be a spread Eagle Backmark.I am not an expert so lets see what others say.

 

[nhbenz]

I'm no expert either, but here is an informative discussion of these: http://www.treasurenet.com/forums/what/339973-flat-button-but-never-seen-backmark.html

 

[WHADIFIND]

I'm no expert either, but here is an informative discussion of these: http://www.treasurenet.com/forums/what/339973-flat-button-but-never-seen-backmark.html

Wow! Thanks! Well, I'll leave it open for a bit in case anyone else wants to chime in, but that information seems close enough for govt work!

 

[HutSiteDigger]

Yep.. American made button just like in the link.. I love collecting eagle back buttons like these... Def. an oldie..

 

[WHADIFIND]

Yep.. American made button just like in the link.. I love collecting eagle back buttons like these... Def. an oldie..

Thanks H.S.D. Haven't seen you in a while!

 

[Patriot Relics]

Great looking piece of American history you have there!