1850, 2 1/2 Rp \"locate post\" red / black without cross bordering, types 34 / 35, horizontal, having full margins pair, apart from thin places reverse in good condition, unused with partly gum, very rare, photo expertize Jean Claude Marchand SBPV (2023) \"scarce unit. \", Michel 15.000.- (Zumstein no. 13 II)