Rome operated a mint in Tyre that produced silver shekels of high purity (94 percent silver or more). These and half-shekels were the only coins accepted by the temple in Jerusalem. The high priests paid Judas with silver shekels like this one to betray Christ (Matt 26:15). This was also the coin Jesus told Peter to find in the fish’s mouth (Matt 17:27).

Source:

Hubbard, Shiloh, Elliot Ritzema, Corbin Watkins, and Lazarus Wentz with Logos Bible Software and KarBel Media. Faithlife Study Bible Infographics. Bellingham, WA: Logos Bible Software, 2012.