Large obsolete (about 70mm) brass cap badge or possibly shako or helmet plate.  The enamel in the center is a bright royal blue though it looks black in the photos.  There were four sets of attachment prongs on the back though one set is now missing.  From wear and patina this appears to have some age on it.  Anyone have any information on this badge?

It looks like a badge from an artillery kartusch case m/1893. That would have been worn with the artillery uniform m/1873 (attila and trousers). That specific badge would have been worn by officers from A1 Svea, A5 Upplands or A9 Positon artillery regiment. 

 

Best regards

Lars

Thank you!  The badge looks identical and it's the right size.  Even older than I thought.