Masticator's ear

The  is the left ear of the Masticator, bitten off in a boxing match in 2241.

When you deliver the knock-out blow to the Masticator during the boxing match, the ear might be added to your inventory. You must be a Berserker to be so violent as to rip his ear off.

Similarly, the Masticator can rip your ear off if he hits you while you have 110 HP or less.

No actual uses beyond being a trophy of becoming a Prizefighter, vends for $750 at Renesco's Pharmacy or New Reno Arms.

Behind the scenes
This is a reference to the infamous boxing incident when Mike Tyson Bit off a portion of Evander Holyfield's Ear.