Help with military button

[Hoosier Digger]

Last year I found this button at a park in Indiana that has been in existence for over 100 years. It appears to be a military button that has been shot through. My questions are - Is this a real military button? If so, is there any way of telling which war it comes from. It appears to have been a two piece button with the back missing. Thanks in advance for your help.

 

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[relic nut]

It appears to be WWI button. Here is an example

 

[Hoosier Digger]

My problem is that I've seen this same design on a WWII button, so I'm still at a loss as to who to distinguish them.

 

[fyrffytr1]

It's a Great Seal button and has been in use since 1902. Your version, with the rim, was made starting in 1910. Without a back mark it will be nearly impossible to date it more accurately. Here is a link to a thread on them. It is a long thread but it will give you an idea of how many different makers there are.

http://www.treasurenet.com/forums/what/112828-great-seal-button-backmarks-help.html

 

[TheCannonballGuy]

From the World War One era until 1923, the US army's Great Seal buttons had what was called "black finish" to keep the shiny brass from giving away a hidden soldier's position to the enemy. There seems to be not even a tiny trace of black finish on your button, so it dates from after 1923.