10c lauré paire et 40c lauré paire (un timbre très défectueux) oblitérés G

10c laurel pair and 40c laurel pair (one stamp very defective) cancelled GC 1756 on the back of an envelope GC 1756 repeated on the front with càd HALLUIN (57) 3 JANV. (weak), long Lm dated of GAND (Belgium) of 29 December 1870. Complete franking.
Without arrival. B/TB.