I am tech guru and Webmaster of Harris Cyclery in West Newton, Massachusetts. Currently, this bike is set up as 63 speed, with a Sturmey-Archer 3-speed hub, 7 rear sprockets and 3 chainwheels. It was originally configured as a touring bike, but I later reconfigured it as a mountain bike. I used to cruise the sand trails of the Cape Cod National Seashore on this bike, back in the '70's.
The chain tensioner is made from a kickstand and a rear derailer. It was kind of scary, because the old Sturmey-Archer AB drum brake was fairly pitiful.
It made all the difference, and since then this bike has been getting regular use. I can't ride this 'til I get around to fixing the New Departure coaster brake.
Nishiki Cresta--tourer built for the Australian market--Scott AT-4 pro bars, DX Rapidfire, 600 EX hubs, MA-40 rims, Uni-disc (rear).
This was a major source of spending money for me when I was in junior high and high school.