Civil War back mark?

[Mississippi]

I have been trying to determine if the is a Scovill civil war back mark. What does a rmdc button look like and what does dm mean. Confused.

 

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[diggummup]

RMDC stands for -Raised Mark Depressed Channel.Nice button.It's listed as a marine button,Civil War era.Here's a similar one for sale $75.00 with a dent-

 

[trk5capt]

Diggum, You Nailed It Good Job. trk5capt...

 

[Night Stalker]

VERY nice find for a Greenie Mississippi!

Great picture...thanks for sharing. HH/NS