Thanks for all comments. About the coat of the arms, please note that the same figure exists on the other face of the blade too. An expert has said that it was not chiselled, but etched with acid work, but so well done that it looks almost as good as chiselling. That is what he says after checking with magnifier.. At the moment,the sword is in his workshop for hilt restoration,so I can't check if the two coat of arms are exactly each other's copy. If it is correct, perhaps shows that it was done in factory included in the contract, or many swords were armory serial etched after delivery from the factory.
I found a Blucher sword's pictures. Here is the link.
http://www.collectorsfirearms.com/ad...hp?itemID=5972 . The blade looks almost same, but hilt and hand guard of my swords look more crude and primitive. The one at the website has machine stamped marks, while mine has only a crudely -but certainly not newly- hand carved "Nr:50" or something like that on its scabbard. Could samples of a single model differ so?