I believe this is Mannesmann Extra tubing. I don't know the specs, but it is quite light. I have a late 40s Benotto made with this tubing and it is very nice. It takes a 27.2 seatpost and the bare frame weighs 4.8 lb (58 cm). This is a bit lighter than a 64 Bianchi Specialissima (5.0 lb, Columbus) or a 61 Legnano Roma Olimpiade (5.1 lb, Falck), both high-end frames in their day.
Brian Samson Vancouver, BC, Canada
On 24-Dec-09, at 8:55 AM, John Barron wrote:
> I have an old frame that has a faintly visible stamping on the seat
> tube. All that I can see are a couple of concentric ovals and the
> word "EXTRA" sticking out on either side.
>
> Does anyone recognize this logo?
>
> John Barron
> Minneapolis MN
> USA
>
> 8" of snow in the first of 4 waves. 20" by Saturday?