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Thanks so much for the assistenza con imagini [MENTION=443609]CoRide59[/MENTION]!

Do not recognise lug pattern...wonder if it could be a long defunct Malaguti example.
[MENTION=357734]Condorino[/MENTION] has written that the Y pattern chainsets found on some Legnano cycles were produced by Way-Assauto. Had always mistakenly thought them to be Giostra products.

Way-Assauto sets are usually unmarked, as we have here, or marked with the name of the bicycle.

Is the I-beam stem an Ambrosio?

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