Cobalt Blue Embossed Larvex Poison Bottle.

Embossed LARVEX Bottle.

 Larvex Corporation was a company which manufactured Spraying Larvex, a pest control product used in moth proofing woolen fabrics. The firm was acquired by Zonite Products Corporation in October 1926. Zonite added Rinsing Larvex to its line of products after the takeover was finalized. The pesticides were also referred to as Larvex liquid and cake.

Larvex Corporation continued as a subsidiary of Zonite Products Corporation until December 31, 1936. On this date Zonite Products Corporation informed the New York Stock Exchange that it was dissolving its six subsidiaries.

Bottom of the Larvex Bottle Showing
Maryland Glass Company Mark.

The circle M indicates the bottle was manufactured by the Maryland Glass Company.

Maryland Glass was acquired by the Dorsey Corporation in 1968, and I believe that the “M” mark was used for a time thereafter, but eventually discontinued sometime in the  1970s.