206 /306 / 319? This site
http://www.7sew.com/singer/319w_hand_crank/index_2.html claims that the 319 weighs 25# with hand crank, and it has a handle on the top. But you have the awkward bobbin-changing issue with the Swing Needles, along with the special needle / no double needle as another drawback.
eta: It had to be modded a good bit. See
http://www.7sew.com/singer/319w_hand_crank/