Mexican coin question need info

Hello everyone, been going through some old Mexican coins and I came across a couple of these old coins and was wondering can anyone tell me what the letters and numbers mean on the back of these coins which are located above the 10?

Would appreciate any info on these coins you can give me
Thank you

 

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The mintmark and the purity of the silver. You can google the rest and figure it out yourself

 

The 1879 HOA is an Km 403.6 Rare find
The 1888 CAM is a Km 403.1 299,000 minted
Im thinking the 902.7 is silver content.
These are the Republic of Mexico coins rare low mintages

 

The letters are the mint mark and the 902,7 is the silver purity of the coin (.9027 pure).

Ho A - Hermosillo Mint, Mintmaster Jesus Acosta

Ca M - Chihuahua Mint, Mintmaster Manuel Merino

The second one is rather hard to tell, but it looks like 1890:
Go RS - Guanajuato Mint, Mintmaster Rosendo Sandoval

 

Bottom two, you can place in your silver pile.

 

Thank you! Appreciate your information

 

Truly appreciate your information! Thank you

 

Thank very much for the information, these are really interesting coins, have lots more to look up.

 

Really appreciate the information Thank you!

 

Your very welcome

 

As an FYI I sold a bunch of these on eBay a few months ago and they consistently realize a lot more than their book value would suggest. I was getting rid of the lower quality coins in my collection yet still getting $5-$10 for 5 and 10 centavos coins that the book showed as basically $2 coins.