Found your sight while looking for information about my old Sekai 2700. Purchased it new about 1981. It has been in storage for the last 10 years and I just can't bring myself to get rid of it. Since they don't bring much(read as worth nothing used) on the secondary market.
Stopped riding about 1996 due to some old neck injuries flairing up and a move to a rural area with no biking paths. So now Del Webb has come to town and there is plenty of pavement available and I am considering the possibly putting some handlebars that allow me to sit up more on the bike to ease the neck strain. It's kind of exciting. I used to love to ride.