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The Barretter is a current stabilising device. The active property of the iron wire within the Barretter is a positive temperature coefficient as with a thermistor. As the current increases, the resistance also increases opposing the rise in current.

The only identification on the envelope is the 7 in a circle.

Thanks to Andrew Redding for identifying this as a Cossor product.

The balloon envelope is 54 mm in diameter, and excluding the UX4 base pins is 118 mm tall.

Reference: Observation.