I recently purchased a 30-40 Krag, with a 1906 stamped near ...

I recently purchased a 30-40 Krag, with a 1906 stamped near the bolt, also there is 8131 stamped 4 different places on the metal. Can't find any serial number tho, it is a carbine but the stock has been sporterized. There is also looks like a crown stamped by the bolt also, anybody know where this 30-40 was made. Thanks