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In the screen capture from the I Love Lucy episode Lucy and the Loving Cup which aired on 7 January 1957, Lucy is wearing the thinly disguised Loving Cup on her head as she travels the subway. On the wall is a Red Cross Disaster Relief poster and an NYC Subway map. Below are pasted in vintage color versions.
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The Red Cross Poster was found on eBay at this link: http://www.ebay.com/itm/1956-Red-Cross-Poster-On-The-Job-Series-Join-and-Serve-/252978239454
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The Subway map looks very like the 1951 version which can be seen at this link: http://www.ebay.com/itm/New-York-City-1951-Subway-Map-MTA-20×36-/371347257031
And finally a few more colors added: