Proof 1d., 2d., 3d., 4d. and 1/-, each stamp-size in black on surfaced card and presented in individual sunken mounts; all with varying degrees of toning though a rare group

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Proof 1d., 2d., 3d., 4d. and 1/-, each stamp-size in black on surfaced card and presented in individual sunken mounts; all with varying degrees of toning though a rare group