The FXDB model was introduced on the brand new dyna glide chassis to commemorate the 50th Anniv of Sturgis (1600 made). The next year, they did the same for the 50th Anniv of Daytona. There were about 1700 of the Daytona model. The FXDB model designation died after these two years. The 91 Sturgis and the 92 Daytona are destined to be collector bikes. I am restoring a high-mile Sturgis now.