The stater is the same as mine a Cholan anonymous Lord of Lanka type. The second is 1/4 "Pagoda" which is scarce the reverse reads "LAN KA" Looks like De Silva #27.
Very nice specimen, all a joy to look at ! On the first OP specimen the text on the side on the right reads "Sri / LanKa / ViBhu": "Fortunate Lord of Ceylon". The right picture of the second OP coin is upside down. According to Michiner it reads "Lakshmi" in a stylized form. But recent references could state otherwise.