I found a Marinoni and emailed the serial number to Marinoni and they got back to me in an afternoon. On mine, the paint had filled in the serial number on the bottom bracket but there is another copy of the number on the steer tube as well and they were able to track down all of the pertinent information. Mine was a four digit number and they could tell me the year of manufacture, tubing type, etc, once they had the number.

Nice bike.