I decided to go back and update my old Katana model as I wasn't all that happy with how the textures turned out on the original.
https://www.artstation.com/artwork/NnnQz
This is the same sword model from before, however, I re-worked the UV map for better optimization and created a new sheath that now shares the same map as the sword.
For anyone interested, this model can be found on the marketplace at the following link.
https://www.artstation.com/vin-c/store/jVqO/katana-and-sheath