Toussaint steel sword is a steel sword in the Blood and Wine expansion and comes in 2 different forms:
Toussaint steel sword (crafted)[]
Crafting Requirements 
Toussaint steel sword (magic)[]
Can be found in the bandit camp north of Termes Palace Ruins.
Also sold by all blacksmiths in Toussaint, except the one at Ardaiso Quarry.