or an L for right or left. Sometimes they do get ground off by folks who prepare the wheel for plating, but not usually. You are probably right (by looking) but it is helpful to check the stamping.
Also, be sure some yahoo did not stick a rear one on the front by mistake. Or that you actually have 4 NA rims? Some have found that on their cars.
"Sell crazy somewhere else, we're all stocked up here." - Jack Nicholson 'As Good As It Gets'