enamelled brass dagger and scabbard, is this russian?

I was given this item yrs ago, but have only just found it again in my cellar..  I have tried to research this item many times over the yrs but have had no luck. I was recently told it may be russian as there is a double headed eagle as well as a peacock in the decoration, can anyone please help in identification and possible value.  there are no markings from what I can see.  Any information would be great and greatly appreciated.  Many Thanks

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