this web site shows them as a grade b bottle meaning between common and scarce and valued about 8 to 15 dollars not sure how up to date it is but gives you a rough idea
http://www.gono.com/museum2003/paintedlbottles/paintedb3.htm
and this one has sompe pictures and info on them
http://www.ca-yd.com/textfile/bottles/ACLWEB_B.HTM
that sign is pretty sweet really nice condition if original that could be worth decent $$
a guy i know found thousands of these unused in a basement. they had never been used. something about they were to come out but war time hit and due to sugar rationing they were never filled. they had been there so long in cardboard boxes they had broke open and where all over the floor he said. he told me he was having to pay by the bottle so they smashed any that were not mint and that was several thousand he said i met the guy 10 years ago and he had had them along time before that. I sell them pretty easy at $6-$8 more than that they sit along time. It is a great bottle i love the picture and colors on it.