If you're a serious bidder on a ref. 2497 you can ask the auction house for photos
link of the dial alone for a better look at things like the sanding marks or windows.
link But you can also look at the back of the dial and edge of the case to make sure it's the correct dial for the movement. the movement number should be visible both on the dial edge and on
link the back of the dial but sometimes those markings disappear.