Just to add a little about the Dogs , this is the opinion of one of the worlds largest collectors of these items and 2 other large collectors that it is possible to tell the maker, and this is what I was told when I recently sold a Vaseline Dog
"quote" Yes, Roy, this is a Davidson dog. I will send you a photo of the
undersides of J D and Davidson dogs side by side. The ridge around the
inside and the shape of the hole for the body cavity tell which maker is
which. The presence or absence of trenches under the front legs is not
significant. Both makers made their dogs both ways.
The picture on left is a John Derbyshire Dog and the one on the right a Davidson Dog
I have also been told by a collector of John Derbyshire who has family connections that the Davidson Dog on the right has a stepped base on the underside