Vintage FRAHM Frequency Meter 380-420 Cycles-James Biddle Co. Philadelphia

Offered here is an original vintage FRAHM Frequency Meter, manufactured by James G. Biddle Co., Philadelphia, U.S.A. This is a classic early-to-mid 20th century electrical measuring instrument, commonly used in industrial, power generation, and military applications.

These meters were designed to measure frequency (cycles per second) and are especially associated with early AC power systems and military/radio equipment, making them highly collectible today.

Key Features:

• Maker: FRAHM (James G. Biddle Co., Philadelphia)
• Type: Frequency Meter
• Voltage Rating: 100–150 Volts
• Frequency Range: 380–420 Cycles Per Second
• Display: Mechanical vibrating reed scale (visible through window)
• Mounting: Panel mount with original housing
• Markings: Clearly labeled with manufacturer and patent number (147274)

Condition:

• Appears to be in good original vintage condition
• Face is clean and legible with light age toning
• Housing shows expected wear consistent with age (see photos)
• Untested – sold as a display/collector piece or for restoration

Historical & Collector Notes:

Frahm frequency meters are iconic instruments used in early electrical