Lucky cutlass

The lucky cutlass is a bladed melee weapon that can be bought from Smith on Mos Le'Harmless for 2,560 coins after completing the quest Cabin Fever. To be able to understand Smith and purchase the cutlass, the player must either have a Book o' piracy in their inventory or have completed the Rocking Out quest. Talk to Smith and select the 'cutlasses' option in the dialogue box. The cutlass requires 30 Attack and has identical stats to the mithril longsword.

The cutlass was judged to be lucky because it was previously owned by a pirate known as Unlucky Jenkins, who died after a long series of improbable and very unlucky calamities. After his gruesome demise, his cutlass was discovered, untouched. The other pirates concluded that, having survived so much terrible bad luck already, it would be very unlikely for it to go through any more bad luck.

Trivia

 * Prior to the Evolution of Combat, this weapon was the best one-handed weapon in terms of defence, with +6 in stab, slash and crush defence.