FULLER "Club Blue"
The wrapper etching was really simplified & reduced which indicates 1950's when a plethora of product packaging was brutally cheapened and de-beautified to reduce costs and increase profits.
Most of you young Pups probably don't remember the Fuller Brush Co whose door-to-door salesmen were a fixture in American Life for many decades in the 20th century. Their famous Brushes weren't their only home consumer product, they also sold razor blades...and, why the heck not? Everybody but Everybody sold razor blades after King Gillettes patents expired in 1924.
Despite millions being sold these are a pretty tough blade to find especially in high grade condition
Fuller Blade Co Inc Hartford CT