Didone design from early to mid 19th century? But which one?
Don

We recently digitized a somewhat similar (but Bolder) set of numbers from a 1838 Specimen Book issued by the Fonderie Clement. Have a look: http://www.impallari.com/clement

Interesting... This one is very similar to another house number very common in Barcelona, but the "2" is not the same

Second set of numbers has some similarity to Firmin Didot by URW:
http://www.identifont.com/show?61P
Also of interest;
Didot's late style as interpreted by Porchez:
http://www.myfonts.com/fonts/typofonderie/ambroise-std/
Michel Bold:
http://www.identifont.com/show?1WH3
Don