I had my frame powder coated, expecting the business to do a good job. They have done lots of bike parts & frames before, so I did not see a reason to point out any particular things that needed special attention. Seems I was wrong. I have had other frames done where the number is legible under the powder, but in this case it was totally obliterated. I needed to sand the area to have the number reappear so that it was readable. I have seen others who have had illegible or non-existent numbers go through hell with uncaring or deliberately destructive cops searching for a number. Older frames do not have a number, but that would not stop them from searching. I have seen some beautiful bikes destroyed in the name of looking for stolen parts. Harleys are not as much in demand by thieves these days, but that would not stop an overzealous cop from performing his duty in trying to apprehend a supposed criminal because they ride a Harley Davidson. Therefore I took the time & effort to show the number on my frame. If you get your frame powder coated, remember to point out that the number must be legible when they are finished.