It's a type of European police hanger I think, one that I've never seen before, it has a distinctive node in the middle of the knuckle bow guard and the acorn motif on the scabbard is interesting. It has the usual brass scabbard chape, that is very common among 90% of victorian period police hangers from Europe and Britain. You can usually spot a hanger scabbard by that feature, as most full length sabres do not have the brass chape, where as the police hangers usually all have them.
Short police sabres are called hangers over here, this is an unusual example. Sorry I can't help you witht he exact type, I've never seen this type of hilt before.