Nice poison RD, I'm thinkin maybe an english poison bottle. I've not seen 1 exactly like that b4 it sure has sweet hobnails on it[] Without POISON embossed on it prolly takes the value down alittle, but I've seen some cobalts similar go for decent cash. As always....very nice Road Dog! Pettydigger
Here is a description of a bottle that sounds like it is just like yours, although I haven't yet found what the BDH means:
Scarce Hobnail Poison. Kuhn type KU-17. This is one of the more unusual shaped poisons. It has a curved back, flat sides and a V shaped front. Two rows of stars on the front panels and vertical ribs on the side panels. Base is embossed BDH in a diamond. It stands 3 1/2" tall and is in excellent condition. The URL for the site where I found this is:
These are known in the UK as hobnail poisons and come in a few different sizes..
pic attatched shows 3 different sizes
found on sites here dating 1910 - 1920