I agree that they are likely made by Tinka, but I also believe I read somewhere that there were other Now closed machine made makers in Argentina in the past.
It looks more like a Vitro Anacortes Classic to me, but thats probably because I don't have Akros like that in my collection as a frame of reference. I bet Ron is right, but still throwing in my 2 cents.
Chad-in the friendliest of ways I am calling you out on the 100 percent of your group are masters. You can twist my arm as much as you like but I will never believe bottom center is not imperial. I will leave it with that one as it is the only one I am highly confidant on. Even one mistake ruins it all. This really is a friendly check.