Have several of these Portuguese stamps with the star shaped holes punched through. I see it says Porto on one cancel,and see Po and o on other two. My guess is some revenue use, much like telegraph holes on Spanish stamps? Probably effects the value in the same way, 20 cents per $20?
I seem to recall that stamps with a star "punch" were used on official (government) mail; Portugal did not have "official" stamps until 1938. Uruguay did the same thing after 1928.
It's worth checking, however, for cancels. I have a Port. stamp, complete with star punch out, and a Macau cancellation from a year or so before Macau started issuing stamps.
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Posted 11/05/2012 8:59 pm
