I'm trying to decide whether to buy this VC 6457 with a K1001 movement. I'd appreciate any advice from the experts here if based on these photos anything of concern stands out. The seller thinks the crown might have been replaced, saying that the gold looks yellower than that of the case. From this photo this appears to be so. It also looks smaller than the crowns on other images of the 6457 I can find. Other than that, the case looks like it might have been polished. Anything else I should be worried about?