A very cool Bakelite subway schedule sign from Chicago, Blue Island subway line. Blue Island is just south of Chicago. This sign is a bakelite frame and then thin bakelite so the light can shine through to show the schedule. This was hung in front of some sort of light box so it shown through. At some time during this signs functional life the schedule changed to 9:01 AM, must have been a tight budget at that time as the change was hand painted on the back side of the bakelite.
A cool sign, can't be to many of these around, it is 23" wide x 12" high and 1/8" thick. Very good condition.