A.S.M.E. Standard Internal Syphon Square Shaped Gauge by Jas. P. Marsh Corp. while the outside is very

while the outside is very simple

but it is too worn to read

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The two claws are secured with screws

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A.S.M.E. Standard Internal Syphon Square Shaped Gauge by Jas. P. Marsh Corp. while the outside is veryHere is a cool vintage pressure gauge manufactured by Jas. P. Marsh Corporation. The gauge is labeled "A. S. M. E. Standard Internal Syphon." There is a large threaded fitting on the back of the gauge, which allows it stand up like a picture frame on a flat surface. The gauge has nice patina and rust throughout, and appears to be in good condition. Dimensions: 4. 5" W x 4. 5" H x 3" D