Purely guessing, but it seems like the date of manufacture and the tank number. For example, produced on 7-30-2013, tank number 273.
Again just my guess. I’d trust someone with more knowledge if they chime in.
A forum community dedicated to Ducati 899 Panigale motorcycle owners and enthusiasts. Come join the discussion about reviews, racing, builds, modifications, classifieds, performance, troubleshooting, maintenance, and more!