Hello friend!
Your stamps are of the Eagles of the Mexican Empire under French Occupation.
* First stamp: 1/2 real - Lilac, Consignment and year: 119-1864, District Mexico - used in 2nd. Period - Scott #20b
* second stamp: 8 reales, Consignment and year: 192-1864, District Mexico - used in 3nd. Period - Scott #25a
The 1/2 real must be brown not lilac-brownish, example (your stamp match with the second of the image of the 2nd. Period):

Regards!
Rodolfo