All amulets have been changed (13th of March 2009) [2] to +10 versions which grant 100% junction effect. For the brief period before that after their introduction, they were randomly spawned between +1 and +10 (non forgeable, non blacksmithable), only granting 10% junction per level.
The wiki doesn't help me too much as I recall another changelog which indicated we should name them for the final 10%?