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Definitely a three tube Del Mundo.A full SL with forks would be about 2355gr. Yours is much smaller than the reference 54cm so should be coming in at c 2200gr. Try weighing it again without BB, headset. Velobase weights are often 'imagined'.
The extra weight in your Mundo is the Aelle forks and stays.
The evidence I have is a beat up Del Mundo I in my workshop from 1980, which is virtually identical to yours.
No chrome on an Italian frame normally = budget. Especially with Bianchi. All about the finish, with the Italians.
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