Heck, F. Racine - fake
Here is another Heck bottle that is very similar to the known fakes. It has the identical stamp as the others which suggests that it too is not old. However, no one has had a chance to look at it carefully to see if it's old. My guess is that it too is unglazed on the inside. Were the fakes really reproductions of this one which is real, or is this one a fake too? Compare them for yourself.