Hello:
I find some errors in these items; first, they are not from MORELIA, they were "issued" in the State of MORELOS (Capital Cuernavaca); and they look to me more as Revolutionary Provisionals (1914-1918) in 1866 they did not use the type of cancel they bear.
To me they are nothing more than cinderellas or privately produced labels; during the Revolution Zapata was the leader of the movement in that part of Mexico and perhaps they tried to imitate the Sonora coach seals of 1914 (Scott 394-413)
Regards,
Fernando Perez-Maldonado