I believe these were Baywater Sweet oysters from Hood Canal in Washington State.  Served with a mignonette and lemon wedges.  Being originally from Washington, I say “Noms!”  Actually, I’m not a big raw oyster fan but I’ve got a sense of native pride to upload, hehe.  These were pretty large and you can’t complain about the great happy hour price!  $18 happy hour
Hog & Rocks, San Francisco