France 1863 – 20c Blue, Serrated Empire (Yvert 22d) — Tête-bêche pair, cancelled GC 2084
Jean‑François Brun's certificate, dated 4 June 2025 (No. 18360), with attached photograph, confirms authenticity. Shows horizontal folds.
Catalogue value (Yvert): Estimated at approximately €1,400.
Recent sales: Similar used tête-bêche pairs with minor faults have realised €500–€700 in 2023–2025 auctions.
