Well I found this on Wiki
"In 1921, Landers, Frary & Clark (L.F&C) of New Britain, Connecticut (a household appliance manufacturer) purchased Stanley Insulating Company and added the Stanley line to their appliance and hardware lines.
In 1933, the entire Stanley operation moved from Great Barrington, Massachusetts to L.F&C’s plant in New Britain, Connecticut. During this time, Harry Badger became Chief Product Research and Manufacturing Engineer and in the following years he continued to develop and add more products to the Stanley line.
In 1949 Harry Badger retired and John Eza became Chief Product Research and manufacturing engineer. From 1949 – 1965 fifteen new products were added and Stanley was now used by airlines, railroads, ocean lines, hospitals and mass feeding institutions."
So I feel that its looks more of a 30s look as Mart suggested. But it appears that if Wull is correct bout its usage, it would date it more to late 40s early 50s...