1961 specification intersection marker. Manufactured between 1968 and 1970.
This sign dates to around 1968. It is aluminum, with reflective sheeting, and has no number on the back, but does feature the Illinois Highway Department stamp.
Photo courtesy of Levente Jakab.
Photo courtesy of Levente Jakab.
Photo courtesy of Levente Jakab.
Photo courtesy of Levente Jakab.
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