Identification of an ancient coin [résolu]

Can any assist me in the identification of this coin.

So far I have worked it that it is Indian in origin (at least I think so) I will add the weight and size later.

please read these:
https://sirimunasiha.wordpress.com/about/the-coins-of-pandyan-and-colas-found-in-srilanka/

http://coins.lakdiva.org/medievallanka/polonnaruva.html
https://en.wikipedia.org/wiki/Polonnaruwa_period

https://en.wikipedia.org/wiki/Transition

http://coins.lakdiva.org/medievallanka/dambadeniya.html
https://en.wikipedia.org/wiki/Kingdom_of_Dambadeniya

Thanks for the sources, I will read up on them.

I am sure that I have a chola 1 stater variant. It differs from this one on numista

https://en.numista.com/catalogue/pieces17657.html

PetrusAscanus is correct. This is an "octopus man" type coin from Sri Lanka and Southern India from the period of roughly 1000-1200 AD. The denomination is a copper kahavanu. These are often attributed to RajaRaja Chola, 985-1014 AD, but many similar coins were made by rulers following him. The references PetrusAscanus has given have photos of some of these variations, so with the coin in hand you may be able to match one of them and determine if it is actually RajaRaja Chola or one of his successors.

Raja raja Copper Massa- The lamp to left appears as a Fish, next to the Trident.

This is the only match I could make to the obverse. Thanks a million for all the help.

I only have coins from the links I provided, not earlier. So I did not really recognize yours exact

No worries, I can do further research in time, do you know of any other sources of information with regard to the coin?

Citation: "kalossaxo"​No worries, I can do further research in time, do you know of any other sources of information with regard to the coin?
​

​No, but you should search internet
https://www.google.com/search?q=Raja+raja+coin&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjU--HWgankAhUS3aQKHQKsD38Q_AUIESgB&biw=1536&bih=723

The best match so far

https://colnect.com/en/coins/coin/21128-1_Rupee_King_Raja_Raja_Chola-India-Independent_Kingdoms_Chola-India_Feudal_States

http://coins.lakdiva.org/medievalindian/rajaraja_chola_massa_cu.html
http://coins.lakdiva.org/medievalindian/rajaraja_chola_kahavanu_au.html

Thanks for all the help, I believe that is the best match. I can now mark it as solved.