Vintage FRAHM Frequency Meter 380-420 Cycles-James Biddle Co. Philadelphia Mossberg serial numbers for the

Mossberg serial numbers for the 500 series are typically a letter prefix followed by 5-6 digits (e

Purpose: Concealed carry and personal defense — it blends the classic aesthetics and controls of the 1911 with reduced size and weight for everyday carry

Integrated key ring / belt loop attachment

6e4654 Note the distinctive No

reflecting the ingenuity and mass production efforts of the U

Vintage FRAHM Frequency Meter 380-420 Cycles-James Biddle Co. Philadelphia Mossberg serial numbers for theOffered 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