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Fine Steel Weapons
Fine Steel weapons are commonly dropped off of city guards, giants, and mid- to high-level enemies.
Players typically have no use for the weapons by the time they are able to obtain them, but they sell for 4-6 platinum each to merchants, and are thus a decent source of income.
If you don't care about weight and are trying to maximize profits with limited bag slots, they sell for the most to least platinum in this order:
Two Handed Sword > Great Staff > Spear > Morning Star > Long Sword > Rapier/Scimitar > Warhammer > Short Sword > Dagger