Lot of 4 NOS HUBBELL Straight Blade Industrial Duplex Receptacle IVORY NEMA 5-20R, 20 Amps, Self-Grounding USA
THESE ARE IN BARNES DISTRIBUTION PACKAGING, I have crossed referenced these and have found they are what is listed in todays numbers. These are old stock made in the USA.

Specifications

Receptacle Type Duplex
Grade Industrial
Color Ivory
Grounding Style Self-Grounding
Amperage 20
Voltage 125V
Wiring Method Back & Side
Flanged No