That blade is on a Sikorsky H-37 (S-56) that is flying over the Sikorsky Stratford factory in the 1950's.
Makes one really think about flying helicopters, huh?
Regarding flight equipment, the former Chier R&D Test Pilot at Sikorsky, who I had the privilege of learning from, flew all his experimental flights in white tennis sneakers.
I often chuckle at the gear we load ourselves down with!