Mexico 1861, 2r black on pink, Hermosillo. Tied by straight line postmark (Schatzkes 541) on 1861 folded letter sheet to Guaymas; minor faint cover toning, Very Fine, only 1,020 issued and few are recorded on cover (NF $125 for off cover single); with 2007 MEPSI certificate. Scott No. 8  Estimate $300 - 400. $0 (Image)