I don't know when this came out, pre-1975 probably.
SE-50 headphones - I have not used them in decades.
They have or had adjustable volume controls on the ear pieces,
but the volume controls got very scratchy or cut out the sound completely;
so on at least one pair I bypassed the volume control
so that the headphones are always at full volume.

No photo currently available; I am working on that.

headphones box

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