U.N.A.C. - United Nationals Appeal for Children An important forerunner cover. Vignette and special U.N.A.C. cover produced in conjunction with the French Red Cross. Registered cover #001. Cover alone cost FFr 100 more tghan twice the cost of registered airmail from Paris to Geneva - and the vspecial postmark 'Sauvez L'Enfance' (Guard Childhood). 30.5.1948