Princess Grace Signed FDC Attractive FDC issued by the WFUNA (World Federation of United Nations Associations) to promote New and Renewable Sources of Energy, with related stamps and 1981 postmark, signed in black felt tip, "Grace de Monaco.” A caption to the reverse indicates that the lovely color cachet is “From a Pressed-Flower Collage by Her Serene Highness Princess Grace of Monaco.” Her printed initials are in the lower right of the cachet. In very fine condition.

Composed of several subsidiaries, the Drouot Group is a major player in the art market. Hôtel Drouot, located in the heart of Paris, has been the world's largest public auction center since 1852. 15 salerooms are available to more than 70 auction houses. The emulation generated by an annual offer of 230,000 artworks from 21 major specialities - from Antiquity to street art - attracts some 3,000 visitors every day. The Group's digital platform, Drouot.com, offers digital sales - Live auctions (live broadcasting and participation in auctions), Online-only auctions (dematerialised auctions) and Buy Now sales (sales of lots at fixed prices). Nearly 2 million items are offered annually by 600 auction houses. Auction news is reported every week in La Gazette Drouot, the leading weekly magazine for the art market and culture published by Auctionspress.