These are Liverpools two seals from old documents that I've looked at:
The Ancient One (original lost sometime around the Civil War)
http://farm4.static.flickr.com/3516/...c838dd.jpg?v=0
The Newer One
http://farm4.static.flickr.com/3492/...dba498.jpg?v=0
This may not be a Liverbird, but it is in Liverpool.
http://farm4.static.flickr.com/3416/...641b2f.jpg?v=0