Prosecco but not in the modern supermarket wine sense of the wine. Unclarified and unfiltered, made col fondo (basically bottled with sediment). 450 refers to the meters above sea level.
Nerd Notes
Glera from Veneto, Italy - grown at 450 metres above sea level.
Made in the col fondo style - bottled with sediment.
Bottled unclarified, unfiltered and with minimal added sulpur.