A Harpy is supposed to be serrated, a plain-edge one is just a anomaly for collectors 
Sharpening serrations is a breeze with a Sharpmaker...that's because in the olden days serrations and Spydeco went hand in hand. Not so much anymore.

Sharpening serrations is a breeze with a Sharpmaker...that's because in the olden days serrations and Spydeco went hand in hand. Not so much anymore.