Proof Sheets: group with 1925 Wills 'Heraldic Signs & Their origin' [25] in three uncut proof sheets, 1927 Wills 'Engineering Wonders' [50] in four uncut proof sheets (no printing on reverse), plus 1927 Wills 'British butterflies' [50] in four uncut proof sheets (no printing on reverse). Mainly G/VG