Its a utility freewheel, 50's era.

2 sides of the English Channel .. Brits went for 3 internal gears,
French shoved the chain sideways to 3 external gears. Derailleur is French.

in the early 60s i built a combination bike, external 3 on a sturmey 3.
it snap ringed on my AW3 Jc Higgins/Puch..
over here , land of Immigrants from both.