Mithril longsword

Mithril Longsword is a free-to-play item on the OSRS Grand Exchange in the weapons category.

In-game examine text: "A razor sharp longsword."

It has a Grand Exchange buy limit of 125 every four hours, a high alchemy value of 780 gp, and item ID 1299.

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Mithril Longsword currently has a flip margin of −110 gp, which isn't profitable to flip right now despite 15,463 trades over the last 24 hours.

Items with negative or zero margins like this are better watched than actively flipped until the spread widens.