inscribed in purple ink on reverse u.c.: "Galactic Event" printed in ink on paper label on reverse u.c.: Vitrograph® overinscribed on previous inscription in fibre-tipped pen on reverse u.c.: "Galactic Event" / a / by / George F. Pollock (rge F. Pollock underlined) inscribed in fibre-tipped pen (diagonally) on reverse l.r.: George F. Pollock (F. Pollock underlined)
