Your example is actually slightly overweight. If genuine, in this condition we'd be talking about a coin worth $1,000+, and given that, it's worth faking in the correct .800 silver composition and paying attention to duplicating the correct edge style.
However, the details of the portrait match up poorly (note particularly the "pointy" nose on yours, also the thinner hair with a space between it and her shoulder). Other variances abound if you look closely.
Even though varieties do exist, based upon the degree of these observed stylistic discrepancies, I'll opine with a high degree of confidence that this one's a modern numismatic forgery.