'Albro' The Albro was a forged-aluminum flywheel that was developed along with a new bonded-bronze clutch facing. Around 1956, with the assistance of Bud Bragdon, Schiefer Manufacturing started mass-producing clutches that were guaranteed to be explosion proof. As word of the indestructible nature of Schiefer's components spread, they quickly became the products of choice for hardcore drag racers.
It's a very early Schieffer flywheel -- forged ALuminum with a BROnze friction surface, hence (probably) Albro. More info: http://www.sema.org/main/semaorghome.aspx?ID=52602