I think juvela nailed the origin (no surprise there

).
Do you have a side view of the head tube and the fork crown? Are the head lugs integral with the head tube or actually brazed onto it? The fork crown and head tube look a lot like those of my first road bike, a bargain basement "Bianchi" (presumably contract-built by Chiorda) my father bought for me for Christmas, 1962 for $55 at Wheel World, Culver City, CA.
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069