Asking For Help Identifying The Datestamp On Thie 10 Centavos Mexico Stamo On 1875 Cover

Dear experts,

I am having difficulty identifying this datestamp on the Mexican 10 Centavos stamp on this 1875 cover to San Francisco.





I've tried using ImageSleuth to enhance any hidden characters, as well as ChatGPT and other AI for image analysis but without success. My observations are as follows;

- The upper portion contains "RA"; maybe Vera Cruz?

- The lower portion contains "ATLA"

I searched for towns/cities in Vera Cruz containing "ATLA", but so far I have been unsuccessful in getting a satisfactory clue.

Any suggestions on the post office/town/city name is welcome.

Thank you in advance,
Hironobu

The bottom of the cancel reads the same as the overprint on the stamp .. MAZATLAN

Dear John, thank you so much.

Now I understand that this 10 Centavos Hidalgo 1874 stamp (Bank Note issue, Scott #107) has been distributed to Mazatlan, and that the overprint "26 74" indicates Mazatlan (postal district number 26) and the year of distribution (e.g., 1874).

So I guess that the upper portion is "FRANCO", and now ready to finish my album page write-ups.

Always learning a lot from you, and thanks again!
Hironobu

The postal marking is illustrated in Taylor -- Postmarks of Mexico 1821-1883, Volume I.

Your marking appears to be Mazatlan 1/16.