Nice photos from Remington 870 Forum:

Remington 870 Wingmaster (1973)

Remington 870 Wingmaster (1973)

Remington 870 Wingmaster (1973)

Remington 870 Wingmaster (1973)

Remington 870 Wingmaster (1973)

Remington 870 Wingmaster (1973)

Remington 870 Wingmaster (1973)

Remington 870 Wingmaster (1973)

Remington 870 Wingmaster (1973)

Remington 870 Wingmaster (1973)