Islamic Terra Cotta Tokens

aout 10mm in diameter, terra cotta

I got some of these in Sept. 2011 from Joel Anderson. Information he had on them is below, I would really love to learn more about these!
These unusual terracotta tokens were produced in the Persian Gulf area around the 11th and 12th centuries A.D. At the time copper coins were not in production. The tokens were produced by merchants or money-changers to provide change for small purchases. The tokens were rarely seen, until a recent hoard was discovered. This hoard included a number of different types. They all are small (about 10-14mm), with various Islamic inscriptions on them. It is an unusual and rarely seen form of money.

Know anything about this token? Please send me a note: pineconeforge(at)gmail.com