I was lazy and farmed only three of the four spawns (one at H/I-11 and the two on the third map). With TH4 still took me about 2 hours to get the ring (needed it for my cor). Drop rate seems to be 2.4% for the ring-- the chest key was significantly easier to get to drop (got 4 key drops while farming the ring). See here for more info if hunting this item: http://wiki.ffxiclopedia.org/wiki/Stroper_Chyme
Azulmagia SAM/RNG at lvl 30 ? u r freakin retarded .... SAM/RNG gets usefull only at 57 when u get sidewinder and at that lvl if u dont have good racc rings ur a gimp