Hi, All,
I bought a Sears Manual 2 off Ebay 6 months ago  off Ebay for $4.99, very pristine and a real steal.  I think no one bid on it because it says Sears on the fascia plate.  I magnified the photo of the backplate and saw that it had been made in Japan, 1976.  I love it--very 70s.  Think Saturn Five, Space 1999, and "Charlie's Angels."  Anyway, I bought a junk machine and it came with a factory owners manual and manufacturer's ribbon spools.  I pirated some parts off the junk machine, including letter keys (mine were worn). 
     According to the owners manual, returning the carriage while depressing the margin release key automatically sets the paragraph indent--neat!  I thought you all might like to know since the manual isn't available online--anywhere--and that's a nice feature.  
Jeffrey