The Société Auxiliaire de Trémuson, a public limited company with a capital of one million francs, had its head office in Paris and was created to support the ancillary activities of the mining and industrial operations of Trémuson, in Côtes-du-Nord (present-day Côtes-d'Armor) — a region known for its lead and zinc mines. Articles of association filed with Maître Bourdel, notary in Paris.

This Bearer Bond of Five Hundred Francs at 8%, part of the 4,000 bonds created under the authorization granted by article 19 of the articles of association, is numbered 04 588 and dated 29 October 1924. Printed by Richard in Paris, it features a dark blue Belle Époque border with arabesque and palmette motifs. Red dry "SAT" stamp and an autograph signature of the director. The sheet has a complete set of attached interest coupons (numbered 26 to 40), with amortization coupons cancelled by red obliteration stamps. Excellent state of preservation, a very complete document sought after for the beauty of its coupon sheet.