I forgot to mention: The boom tube is oval. I wonder if that's unusual, a narrow overlap in time with the Marathon lateral. Lots of bikes with Marathon laterals had twin boom tubes of regular-profile tubing, and ovaled tubing came later.
I'm preparing a photo gallery of its interesting details. Meanwhile
it's in action at
http://picasaweb.google.com/
I replaced the drop bars in back with a modern bullhorn stoker bar, to
give her a bit more space to stretch out. I also replaced the
original brake levers because it had both rear cables running to the
right lever in a period-correct sort of way. I wanted to be able to
control the drum and the cantilever separately, and I couldn't
generate enough squeeze force (especially from the hoods) to get
usable braking power out of them both simultaneously. So now the drag
brake is controlled by the shifter on the stoker's left bar end. We
also both prefer SPD pedals - yet another unacceptable modern touch
for a retro perfectionist, but hey it's a daily working bike not a
museum piece!
--
Bob Sutterfield
Saratoga California USA