According to https://casasciustracker.com/status/

Series                            Total   Active  Redeemed    % Redeemed
Series 2 -  0.5 BTC           3123    2139   984                31.51%
Series 3 -  0.5 BTC Silver   940    843      97                 10.32%

However, I lack the encyclopedia to understand which version this coin is?