Bobblehead - Unarmed
"When words fail, there's always fists."
The location of Rockopolis as seen on the world map
Inside a cave directly north of Girdershade and directly west of Smith Casey's Garage. In a forked valley which is a "random encounter" location, look for a big rock under a string of tattered black banners. At night, light visibly emits from the rock, making it easier to spot.
Unlike other skills Unarmed is uncapped and as such continues to increase above 100, meaning this bobblehead will increase the Unarmed skill beyond 100 if necessary.