Thanks for the tip. The dropouts indeed led me to believe it might be aluminium, they don't have cut-outs but they're not extremely chunky either. They look similar to the ones on the black altec above but also similar to the ones used on this foco steel frame:
Thanks for the tip. The dropouts indeed led me to believe it might be aluminium, they don't have cut-outs but they're not extremely chunky either. They look similar to the ones on the black altec above but also similar to the ones used on this foco steel frame: