The first Duesenberg instruments already feature a six-digit serial number, which is based on the YYxxxxsystem. The first two digits represent the year of manufacture, the following four digits show the consecutive production numbers for all models and all years until 2009.
950023 = the 23rd Duesenberg instrument, built in 1995.
990765 = the 765th Duesenberg instrument, built in 1999.
In 2009, this system was revised, redefined and has remained current to this day. The serial numbers still have six digits, the first two digits still indicate the year of manufacture, but the following number now represents the production number across all models and per year.
101145 = the 1145th Duesenberg instrument in 2010.
201483 = the 1483rd Duesenberg instrument in 2020.