original Marc Chagall mosaic tile from the Four Seasons piece in Chicago (65)

about 5x7" This is the only one of these I have. In 1994 it was renovated and a protective glass shield was installed. This is an actual tile that Marc Chagall would have had his hands on in 1974 when it was created. I tried finding out more information about these on line, like how many were given out, but can't find anything. The signature on the back appears to say "R.L. Thomas". Richard L. Thomas was an executive at the First National Bank of Chicago (which was bought by Bank One in 1998, which then merged with Chase in 2004). That's about as much as I can remember on the history. I have been the only owner of this piece and it is still in it's original box and wrapping. Thanks for looking! Of course if you know more about this, I'd love to hear from you.