Quote:
Originally Posted by Tubejunke
No ZIP code prior to 1964? Where is a ZIP code? Does this mean on the front near the bottom where the company name and such are?
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Prior to 1964, postal codes in the US had a "Chicago 44, IL" convention. With the advent of the Zone Improvement Program (ZIP), codes were expanded to 5 digits, until the advent of the 9-digit codes in the 1980s.
The manual in the auction had Simpson's Chicago address with the old convention, hence pre-1964. The design patent for the original 260 dates to 1937, IIRC. So broad swath I painted, as I could not nail down an exact date, but series 2 and above are all identified as such on the meter face....
In all my years of repairing, calibrating (and collecting), I've never dealt with any Series 3 or prior, but I have a Bell Systems 260 (KS-series meter...), with no Series listed. The UL stamp inside is post 1955...using UL's guide.