1st - I noticed this was your very first post - so, Welcome Aboard Socks! You didn't list your state (or country) in your profile. So, you might consider jumping over to Sub-Forum: Select Your Area.... for information (i.e., clubs, hunts, finds, legends, maps, etc.) directly related to your state (or country).
2nd - Until a member pipes in - I pulled these from other TN threads...
If you could give us some background information as to where you found this button, city, state or country.
This might help us narrow down whether it's military, school uniform or a civilian button.
I can see a Crown, a Coat of Arms and two animals on either side of the Coat of Arms.
Although, your button does resemble the Coat of Arms of Canada and England.
Dave
Just offering some friendly-intended educational information here, because the info is important for correctly identifying this and other buttons.
Actually, that is not a crown. It is what is called a Coronet. Notice that it has several "knobs" spread out in an arch at its top.
Crowns are worn by Royalty. Coronets are worn by the Nobility... such as a Duke, a Baron, a Count, etc. Each of those ranks is represented by the number of "knobs" shown on the coronet. (For example... IF my memory is correct, 5 knobs means a Duke.... but I might be miss-remembering.)
Also... this button SEEMS (I can't tell for sure) to have what button-collectors call a "self-shank back"... on which, the back itself forms the tunnel for the thread to pass through, instead of having a separately-made-and-applied wire loop. We need a sideview photo, to show us the actual shape of this button's shank.
One of the photos attached below shows a Coronet on a "Livery" button. The other photo shows one version of "self-shank back" -- all of which are from the 20th-Century.