The listing, USA #2508-2511 1990 Sea Creatures block of 4, mint has ended.
USA stamp commemorating sea creatures (dolphins, otters, sea lions and whales
Year: 1990
Catalog # 2508-2511
Condition: full gum, mint never hinged, post office fresh
GIN is available!
I have only 1 of these blocks! The scan is what you will receive.
My general terms for stamp-related Listia lots can be found here (please read, it answers a lot of basic questions):
http://listiarules.webs.com/