inscribed in purple ink on reverse u.c.: ENERGY BUBBLE artist stamp in purple ink on reverse u.c.: SIR GEORGE F. POLLOCK, BT., F.R.P.S., / THE WESTCOTT ART CENTRE, / 5 MAIN RD, WESTCOTT / NR. DORKING, SURREY, / DORKING 4361 printed in ink on a paper label on reverse u.l.: Vitrograph® overinscribed on previous inscription in fibre-tipped pen on reverse u.l.: "Energy Bubble" / a / by / George F. Pollock (underlined)
