I am no expert in russian swords so I can not tell you if its real or a reproduction. I do hovever think that the provenance of the sword might help in determining if it its the real deal. There is a big difference between finding it in in the attic of someone who was an officer in the imperial russian army and buying it on E-bay from India.
I must say if its a reproduction it looks very authentic. I have however seen a large italian auction house sell several reproduction shashka (described as second half of the 20th century) that looked pretty old and authentic to my untrained eye