I may be wrong, but I assume "Alegoría type I" has the un-crowned matron with shield on the obverse, since that seems to be the most common design. The J.Saz I found at the SOS (crowned matron without shield) must be either Alegoría type II or III, which seems to align with Antonio's info above. In the Medalla Militar document Antonio sent me, the description of the medal's obverse mentions the matron (woman) and laurels, but no shield -- perhaps some artistic license was granted by the medal commissioning authority.
Jacques, I recognize the S&L catalog photo you show. What company catalogs are the other two photos from? Can you provide a larger photo of the S&L medal that might show more detail?