Spotted this, looks to be of vintage and American made, would be post 1968 when the Super Artillery Branch of 1957 spits into two in 1968, with Field Artillery reverting its traditional Crossed Cannons insignia,  but we haven't the foggiest as to why made and what these would be worn on,

Only thing I can think of is they are not US insignia. Many small countries had their insignia made in the US, N.S. Meyers made a lot of insignia for South and Central American countries. When they went under every thing in their wear house hit the collectors market.