Olof Jonsson managed to read the ring on the Sandwich Tern on the Azores. The ring number was PL 0129 and the bird was ringed at Gdańsk Świbno, Ujście Wisły, Poland on July 1st 2009 confirming the field identification conclusions.
Original post on this
http://peteralfreybirdingnotebook.blogspot.com/2011/02/sandwich-tern-or-cabots-tern.html
The bird was ringed as part of this Polish Ringing Project: http://www.kuling.org.pl/uw/lipiec.html
Warning: Do or don't look too closely at the Polish ringing link above- there may be an out of range shag on one of the sand bars!
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