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05 nov, Moscow, park, on birch.
Arista and taxi spots on abdomen - like Sarcophagidae.
But there is obvios metallic colour, especialy on abdomen. It leads to Calliphoridae.
Two more fact. Normaly this time in Moscow is full winter. But:
1. Wings look like that of very fresh emerged fly.
2. Today (without camera) I found the same (95% sure) flies rather common on the sunheated wall of house.