The Watchmakers sword V1, edited/corrected with ideas from
Christopher Stone-Bush , PK Sullivan , Jonathan Spengler , Alfred Rudzki
The blade itself looks totally normal, but crossguard and grip tell a different story. Trough a round small glass panel in between hilt and crossguard you can see a multitude of small gears and counterweights, in motion and making clicking, whizzing sounds whenever you move the blade.
When you spend time winding the sword’s gears, roll +nothing. On a 10+, gain 3 torsion and on a 7-9, gain 1 torsion. Spend 1 torsion to give the sword either the precise or the forceful tag for your next strike. Spend 2 torsion to throw the sword with Volley.
Example picture from Deviantart: http://fc06.deviantart.net/fs31/f/2008/220/1/b/Gear_Sword_by_NerinokuKai.png
I would have imagined the mechanisms much more concealed though, as you see from my description!