I am guessing this letter opener is from the early 1950's. Some research indicates Jack Gross sold his interest in KFMB radio/TV station in 1953.
Art deco style opener with enamel plaque "American Network, KFMB, San Diego. The Jack Gross Broadcasting Co."
Shows some minor wear and the tip is a little bit bent, probably could be straightened out if you want. High quality construction, heavy metal.
Send your zip code for ship cost- should be between $3.95 and $5.95 if you are in the continental USA (Nov. 2012).