Примеры типа

Личная коллекция
ND (1970) – (en) Series A; engraved (with grey border at top of reverse and purple border at bottom)Подписи: CMA, FIB(en) Series A; engraved (with grey border at top of reverse and purple border at bottom)
145 × 70 мм

ND (1970) – (en) Series A; engraved (with grey border at top of reverse and purple border at bottom)Подписи: AIC, JBM(en) Series A; engraved (with grey border at top of reverse and purple border at bottom)

ND (1971) – (en) Series B; lithographed (with grey/green border all around reverse)Подписи: AIC, JBM(en) Series B; lithographed (with grey/green border all around reverse)