It appears to be similar to a Brunswick-Wolfenbuttel 6 Thaler, at least one side does. The 1956/57 on the other side strongly suggests a replica. Replicas were commonly made in Germany, but all are normally clearly marked with a modern date and fineness so that there should be no confusion. I cannot find the image of the original/ the other side in Krause, but I do not believe that Krause is comprehensive in this area.
Assuming it is a replica, it has some premium over the silver content.
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