Dropped off of a Barrow-wight in the south Barrow-downs for me, though mine is slightly different, it doesnt have the +1.0 Target: You have a small chance of stunning your opponent ability, and in its place it has 'Target: You have a small chance of lowering your target's ability to Evade.'
And the lore description says:
"Crafted in Rohan and forged for the brave men if the King's Guard, finely tooled and well-balanced."
Other than that it is exactly the same.