Originally Posted by
onespeedbiker
As far as I know they are the same; these chains were used universally from about 1920's to the 1950's.
"skip tooth" chains are easy to find. "Block chains" are a lot tougher (and more expensive). Block chains are way cooler for a period race bike. But if you are just going to ride it on the road I would go with a standard pitch 1/8" drivetrain. It will be smoother, quieter, and a lot cheaper.