Is this civil war era??

[absosecur]

Thanks for any help.

 

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[Mackaydon]

Some history: In 1776, the device consisted of a fouled anchor(tangled in its rope) of silver or pewter. Changes were made in 1798, 1821, and 1824. In 1834, it was prescribed that a brass eagle be worn on the cover, the eagle to measure 3.5 inches (89 mm) from wingtip to wingtip. An eagle clutching a fouled anchor with thirteen six-pointed stars above was used on uniform buttons starting in 1804. This same insignia is used today on the buttons of Marine dress and service uniforms, with the six-pointed stars changed to five-pointed stars--as is yours.
Don.......

 

[absosecur]

Thanks man. U are very knowleable.

 

[got2dig]

What is the back mark?