Just reading an interesting post over at the Nocturno.it forums - Apparently in the original theatrical version of Milan Calibre 9 there's a timer throughout the film that appears right up to the end, starting on Monday and finishing on Monday. Counting down the events...
They mention it was probably inspired by Melville's 'Le Samourai' (which I thought was great but haven't seen for years... anyone here remember the timer?) The French version of 'Tony Arzenta' also has a timer counting down the story...
This doesn't appear on ANY of the subsequent VHS/DVD/Bluray releases - Seems it meant quite a lot to Di Leo to include it, but nobody ever did. There's talk that it's on the original negative.
Here's a link to the discussion (Italian)
http://forum.nocturno.it/index.php?topic=33836.0