Hi and welcome to the forum
The 43 and 49 markings may suggest a 1940s manufacture, but the FEDERAL LAW FORBIDS embossing does, as you state, put the age in a 30 year bracket.
Value for 20th century bottles like this hinges on original condition with label - contents helps too - without these extras, this is a common bottle with little or no demand.
Browse ebay using the search string "Federal Law Forbids" to get an idea of what is being offered and what is selling / not selling.
Chris