RARE c1930s Chicago's Board of Trade Building Observatory Ticket Stub

Description

Neat and rare 1930s souvenir ticket stub for visiting Chicago's Board of Trade Building's Observatory. Great graphics of the building but a little funny note - they shaved down the size buildings on La Salle street to make the building look bigger!
The new building opened in 1930 and was Chicago's tallest building until 1965. About 5 years after losing this status, the Observatory was closed to the public.
There are a few things pointing to this being from the 1930s - no numbers on the ticket - this is quite odd even during this period and my guess it was something overlooked when first ordered. Plus, I did find a 1945 example with a price of 50 cents - this is priced 25 cents and would have been somewhat important to be relatively inexpensive due to the depression. It's rare so I don't have other examples to confirm a date but I'm pretty confident.
Excellent condition - no blemishes to speak of. Very well preserved.
Approximately 4-1/2" x 2-1/2"; thicker paper material with a matte finish. The back has no print.