History is alive! Coin collecting can be wondrous at times, much better than having to read a book or YouTube drivel.
Portugal did side with the Allies. Portugueses troops fought in what was then German West Africa (today's Namibia) and in Mozambique.
Some great coins are in this string of replies. I know my grandfather fought in Belgium with the Canadian forces. He gave me my first set of foreign coins when I was six.
I pulled this one out again and took much better pictures with better lighting. Untouched except to crop. Same coin as above. 1914 German 1 Mark