US/British Army Original - Model \"Director NO 7 Mark IV-Anti-Aircraft Sight For Sale

Please see all images before purchasing. Offers No. 7 Mk IV: The device is a \"Director No. 7
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Mark IV\", which was a specialized sighting instrument used by the British Army, and United States Army particularly during World War II, for aiming anti-aircraft machine guns or directing artillery fire.
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Identification Number: The serial number No 14932 is engraved on the instrument.
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O.S. 99 C.A.: This marking likely refers to an \"Ordnance Store\" number, a classification code used by the British military to catalog equipment.
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Broad Arrow Mark: The small symbol resembling a triangle with a vertical line through it is a \"Broad Arrow\" stamp, which indicates the item was British government property.