[quote=@Skepic]
<Snipped quote by Alfhedil>

Would it be a metal that could be essentially mined by all nations, just Eisenkreis has been able to find a better use, or would it be a resource that is literally only found in that nation? 
[/quote]

Weighing both options to see which would make more sense, as well as be more feasible. On one hand, I could go the route of a material found exclusively in the mountains of the Eisenkreis region. On the other, I could highlight their industry and technological prowess, and make it an alloy akin to High-Speed Steel, except not quite. Still pooling ideas and seeing what I like more and what would make the most sense.