Button identification Confederate Engineer - help!

[bilnsan]

We have collected buttons for years and recently discovered that many of these may be Civil War uniform buttons. We are doing our best trying to identify these and would appreciate any help. The back is marked SUPREME QUALITY and the button measures 5/8" diameter.

 

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[Masonlid]

It appears to be a calvary button.Isaac,campbell of london made ones similier to this.There is a slite difference in the two.