This is a disc meter with split case and serial number 6,611,329 that fit a ⅝” pipe, and that was made by the Neptune Meter Company in Long Island City, New York, around 1943. The Trident was based on designs patented by John Thomson, a prolific inventor and member of the American Society of Civil Engineers.
Ref: Neptune Meter Company, The Trident Water Meter (New York, 1895, 1901, 1903).
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