Lightest Steel Frame?

There's an acceptance of a certain level of dishonesty in advertising that varies with period and nation/culture.
That's certainly a surprising weight to achieve with the equipment of the period and function pictured.
Is it a coaster brake?

Sadly I'd need to hang it on the scales to believe it😪
 
Ishiwata did by far the thinnest wall tubing. 015 would have been the lightest frame you could build, assuming you were light enough to ride it safely!

Some of the current Kasei tube sets used in NJS keirin are probably as light. Stronger steel and multiple butting too.
 
8kg is decent, but a double chainring, front changer, lever and extra length of chain would probably put another kilo on it, which is about normal for a 531 road bike.
 

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