Originally Posted by
Seizedpost
Cheap 10 speeds from the 70s also usually had stamped dropouts. Those look forged.
Yers, they look rather like Milremo dropouts with the derailleur hanger amputated:
"Milremo" was
André Bertin and Ron Kitching's house brand, and the dropouts were used on their own bikes as well as available to third-party builders.