Button Experts needed... never seen one of these!

[chukers]

Here is one of my recent finds... I have foud alot of military buttons but never seen one like this

Looks like a Navy Button?

Age?

Gold Plating?

Need some help...

Chukers

oh its a little bit smaller than a dime's diameter

 

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[Mackaydon]

Scroll down a ways here for a similar button:
http://forums.ebay.com/db1/topic/Historical-Memorabilia/Brass-Military-Button/1000664297
1898-1935 as per here:
http://pw1.netcom.com/~jimyce/bm.html

Don....

 

[TheCannonballGuy]

It is a cuff-sized US Marines button. The gold gilt means it was for the "Dress" uniform, not the Combat/Fatigue-duty uniform (which has dull-finish buttons). The "Horstmann Philadelphia" backmark's lettering does not have serifs on the letters, indicating 20th-century manufacture.

Edit: To prevent anybody from misunderstanding my dating of your button's backmark. There are other versions of Horstmann backmarks with no-serifs lettering that date back to as early as 1865. But your button's exact backmark ("Horstmann Philadelphia") with no serifs dates it to the first half of the 20th-century.