Yes, the radiant cap is in other coins as well. I collect 1888 coins, and the 1888 Mexican coins had it in all denominations.
I had to look up "Porfirian".

Porfiriato, the period of Porfirio Díaz’s presidency of Mexico (1876–80; 1884–1911), an era of dictatorial rule accomplished through a combination of consensus and repression during which the country underwent extensive modernization but political liberties were limited and the free press was muzzled.

Which eagle was that?
!BBH
!LADY
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