Uniball Signo 307 will fit a high-end Waterman rollerball. The Signo 307 refill has a fraud-proof ink formula - so if you are going to be signing documents, yo

Uniball Signo 307 will fit a high-end Waterman rollerball. The Signo 307 refill has a fraud-proof ink formula - so if you are going to be signing documents, you better use this.