Congrats; a real steal for $40. Leave it as is. With the cross-hair design, the dial is quite attractive (not much that can be done anyway). The marks on the caseback are deep and skimming it will not look good (it will be as much an eyesore as the existing scratches). And it cannot be undone. When the watch enters the $10k territory thanks to Hodinkee recognizing it as a landmark design of 20th century design, you can invest in some case restoration involving laser welding
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