Just based on these scans, your 500 appears to be a 499. The scans are a bit blurry and indistinct, but the toga rope and button do not appear to be sharp and heavy enough to be a 500. On the majority of the 500s, the toga button outline really stands out strong. You can go to
www.seigelauctions.com, use the power search, enter the catalogue number 500, and pull up 500s that have been in their auctions. Use the image magnifier to enlarge the images and compare it to your stamp. If your 461 is flat plate printing, perf. 11x11 and has a single line watermark, it should be a 461.
