Mexico, (Soyaniquilpan) Soyaniquilpan, straight line postmarks (YB SY3 and SY4) on two complete letters, dated and docketed, the 1st 1851 with 2 line "Franco", the 2nd 1855 with a straight line Soyaniquilpan., Very Fine. Estimate $300 - 400. $0 (Image)