It is Classic/Kunark (from 08/17/2000 patch notes):
www.tski.co.jp/baldio/patch/20000817b.html
Code:
Players can now indicate that they are "looking for a group" by typing /LFG. This
command will flag your character in both zone-specific /who lists, and the
server-wide "/who all" list with "LFG". The LFG flag will remain active until
you either enter a group or log out. Players can search for other players
who are LFG by using filters in the /who command. For instance, to find
rangers between level 40 and 50 who are looking for a group across the
server, type "/who all ranger 40 50 lfg".