I found this posted on alla may 1 2000 under the wrist section. So obviously it was in the game at that time.
http://web.archive.org/web/200005110...llakhazam.com/
do a ctrl+f for scale and its there.
Shackle of Scale: AC 9. Wt. 0.5. Iksar Monk only. Obtained through an unknown Cabilis Quest.
I started Jan 13thish 2001, so after velious, and i did this on my monk before it was removed from the game which was during summer.
This link is for the quest.
From alla at that time.
Last modified on Tue Jan 2 20:12:52 2001
48 people have rated this quest
http://web.archive.org/web/200005110...llakhazam.com/
None of the forum links seem to work but you can tell by the titles of the post that plenty of people have completed it by that time.