I didn't weigh them but I hefted a pair at Elliot Bay Cycles and they felt about the same as a set of Nuovo Record arms, which in turn are about as light as modern carbon fiber arms. There's progress for you.
Did we ever figure out how they make these things hollow?
Kurt Sperry Bellingham, Washington USA
2009/8/28 Harvey Sachs <hmsachs@verizon.net>:
> If you don't do anything else this weekend, stop and peek at the photos Amir
> posted: <snip>
>
> Photo at: http://www.flickr.com/
>
> The hollow, steel, Duprat cranks (cottered) are awesome, even today. Years
> ago, I weighed one of the right cranks. It was 3 grams heavier than the
> equivalent aluminum TA 5-pin. About 1.5%. Sure, I didn't weigh the whole
> crankset, and there would be other weight differences (shorter cotterless
> crank, cotters may weigh more than cotterless attachment bolts/washers,
> etc), but it is still a pretty impressive piece of production work. My
> friend Jim Papadopoulos gave me a set decades ago, and I've used them
> regularly eve since, on fixed gear bikes. Right now, they're in service on
> my '53 Ephgrave.
>
> Thanks, Amir!
>
> harvey sachs
> mcLean va usa