Toutatis or Teutates was a Celtic god worshipped in ancient Gaul and Britain. On the basis of his name's etymology, he has been widely interpreted to be a tribal protector. Today, he is best known under the name Toutatis (pronounced [towˈtaːtis] in Gaulish) through the Gaulish oath/catchphrase "By Toutatis!", invented for the Asterix comics by Goscinny and Uderzo. The spelling Toutatis, however, is authentic and attested by about ten ancient inscriptions. Under the spelling Teutates, the god is also known from a passage in Lucan.
Reference: Wikipedia
The "ToT" rings were in use by both Celts and Romans. The latter sometimes identifying Teutates with the god Mars.
This ring is a recplica of a Roman ring found in Lincolnshire, England. The archeological artifact, this item was based on, is dated 2nd - 3rd century A.D.
The ring is made of sterling (925) silver. It can be regulated between size 7.5 and 10.5 US scale (56 and 62 european scale).