Guess the Chola Dynasty wasn't enough to help you classify it to Southern India. Raja Raja Chola, of the Chola Dynasty in Southern India, conquered Ceylon and brought back the coin design to India. It set off a several century copy of the design in various forms in Southern India between the three major dynasties, the Cholas, Pandyas and the Cheras. Your particular coin is what is called the "dumpy" version of the Kasu from Raja Raja Chola. The fabric and design degraded a bit in whatever mint that it was produced. Here are some examples from my collection:
Imperial Chola of Southern India: Raja Raja Chola (985-1014) Æ Kasu (Biddulph-21)
Obv: King half seated, with raised arm on right; Devanagari legend beneath raised arm; श्री राजा राजा (Sri Raja Raja)
Rev: Standing man, with lamp on left and fish on right, representing the Pandya conquest
Imperial Chola of Southern India: Kulottunga Chola I (1070-1120) Æ Kasu (MCSI-345)
Obv: King half seated, with raised arm on right; Tamil legend beneath raised arm - கு (Ku)
Rev: Standing man, with lamp on left and group of pellets on right
Imperial Chola of Southern India: Raja Raja Chola (985-1014) AV 2 Fanams (Ganesh-1.8)
Obv: King standing looking right
Rev: Devanagari legend in two lines - उया कोंडा (Uya Konda)
Arya Chakravartis of Jaffna: Anonymous (ca. 1284-1410) Æ Massa (MNSI-862)
Obv: Seated king on left facing right with Tamil legend செது (SETU) vertically below his arm.
Rev: Standing king with crown consisting two lines and a dot, trident on left under raised right arm. A bull couchant vertically with a circle before it. All in bead circle. group of spheres on right, surmounted by crescent.
A gallery of my coins and artifacts can been seen on
FORVM Ancient Coins