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This is an antique brass steam gauge made for the Newell Supply Co. of San Francisco. 1878-1897
The dial face indicates it measures up to 150 PSI.
The gauge uses a Bourdon tube mechanism, as indicated by the text "BOURDON" on the lower part of the face.
It was manufactured by the Ashcroft Manufacturing Company of Boston, Massachusetts, a prominent maker of gauges in the late 19th century.
Similar antique gauges were commonly used in industrial settings such as ships, trains, or fire suppression systems. Steampunk
