Authentic Industrial Grade Ashcroft Antique Low-Pressure Steam Gauge Mid-20th Century

Measures:  7.5" diameter (end of black base to other end).  7" diameter (chrome rim).  Measures: 2.5" tall.

Below are some details found on Google AI:

Decoding the Markings

"Made in U.S.A": This is a standard mark for Ashcroft instruments manufactured at their headquarters in Stratford, Connecticut (where they moved from Bridgeport in 1951).

• "Quality": This was a specific branding used by Ashcroft for their commercial and industrial-grade lines. It signifies the gauge met the standard ASME (American Society of Mechanical Engineers) accuracy grades of the time (typically Grade B, which is ±3-2-3% accuracy).
• "45953006": This is a unique serial or part number. While Ashcroft’s modern date codes are typically 4 digits (Week/Year), an 8-digit sequence like this is common on older industrial models to track specific production batches or custom OEM (Original Equipment Manufacturer) specifications. 
  Grainger +4

Modern Use & Compatibility

Because this gauge has a 0–15 PSI scale, it was likely used for:

1. Low-Pressure Steam Boilers: Common in residential and light commercial heating.
2. Air Pressure Monitoring: Often found on large industrial compressors or HVAC systems.
3. Fire Sprinkler Systems: Older "dry" sprinkler systems often utilized 15 PSI gauges to monitor air pressure within the pipes. 
   Grainger +2

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Collector's Tip

The presence of the "Quality" mark and the all-metal housing (visible in your first photo) makes this a "Bulkhead" or "Flange Mount" gauge. These are highly desirable for industrial-style decor because they can be easily mounted directly to a wall.