So I think I have a matchup that's not listed in the catalog for Mexico - 10 centavos https://en.numista.com/catalogue/pieces15262.html
Unless my coin is something different and I can't locate the correct coin.
The first coin (10 centavos) is KM#403.1 and is listed as 1893 M rather than 1893 CaM. The second coin (5 centavos) is KM#398.1 and is listed as 1888 *M rather than 1888 CaM.
Krause does not provide the mint mark for Chihuahua in the listing for these coins. The Chihuahua mint used different mint marks (CH, Cᴀ, CHᴀ, and CẠ). For these particular coins, both CH (or Ch) and Cᴀ (or Ca) were used. The Numista listings match the Krause listings.
By the way, the M is the assayers initial (for the Chihuahua mint from 1868-1895, the M stands for Manuel Marino).