1940-1960s Sun Shipbuilding Dry Dock Co. Pressure Gauge, Chester PA by Ashcroft

The Ashcroft company is one of the oldest and most well known pressure gauge companies to date. With business origins starting in 1870s, there is a long range of verified and documented history on the trade marks used on pressure gauges. Based on that information, we can reliably say that this small pressure gauge is from 1940-1960.

This pressure gauge was made for the Sun Shipbuilding & Dry Dock Company in Chester Pennsylvania.

Wikipedia Summary of Sun Shipbuilding & Dry Dock Company:

Sun Shipbuilding & Drydock Company (1917–1982) was a major shipbuilding company in Chester, Pennsylvania with a large shipyard on the Delaware River. Originally built to supply tankers for the Sun oil company (Sunoco), it would later build tankers for their US government and other oil companies, before building many different types of ship’s over its 70-year history.[1] During World War II, it participated in the U.S. Government’s Emergency Shipbuilding Program.[2] At the height of its operation in the Second World War,[3] the Sun campus was the largest shipyard in the world, employing some 40,000 workers.[1] – https://en.wikipedia.org/wiki/Sun_Shipbuilding_%26_Drydock_Co.

Glass face diameter = 5.5″