 Although not normally made available to the general public, some have found their way into private hands, and they are a recognised stamp collecting speciality.Test stamps are a form of cinderella stamp and in the United States are also commonly referred to as dummy stamps.In some countries there may be cross-over between test and training stamps but while test stamps do not need any stated value, training stamps are often produced in a variety or values or are genuine stamps cancelled by bars as this assists with the training process.