WW2 Mexico Navy Cross for Special Merit?

[Shots Dave]

Hi Gents

I have recently acquired this medal but the only description I can find in Alec A. Purves "The Medals Decorations & Orders of the Second World War" begins the detail as "A silver cross pattee with ribbed arms and small ball finial". There is an example similar to this shown on the eMedals site within sold Mexican items. Can anyone confirm whether this might be an earlier version than that described (due to the enameling and reverse ribbon loop for example) ?

Thanks in anticipation

Dave