SILVER DOLLAR RES INC. (SIDRF: Pink Current) | Symbol Change Fri, Sep 11, 2020 12:00 - SILVER DOLLAR RES INC. ( SIDRF : Pink Current) - Symbol Change - The symbol, SIDRF, is no longer a valid symbol for SILVER DOLLAR RES INC.. As of Fri, Sep 11, 2020, the new trading symbol is SLVDF. You may find a complete list of symbol changes at otcmarkets.com .