[GreenKeys] seac computer but this vendor sems to have 2 one tty one frieden console

[COURYHOUSE at aol.com]

http://www.ebay.com/itm/24x36-Poster-Teletype-Keyboard-Printer-Seac-Computer
-1950-History-/291793162498?hash=item43f03a5102:g:vsEAAOSwoudW6r1A
is this a  19 a 20 or?
 
 
yet   this poster seller  claims this to be a SEAC   computer too...  yet  
has a flexowritter on itdrr  poster  below.
 
 
http://www.ebay.com/itm/24x36-Poster-Seac-Computer-Computer-History-/2917931
83045?hash=item43f03aa145
 
what do   you think?  and is that      first one a  15 a 20 or a????

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