Hi Frills, I'm not a Patek owner and have no experience with their service (although a friend of mine thought although friendly, they are a bit rigid). Anyway I'd be kind of surprised if Patek would change a dial on an existing watch to a dial not offered in that metal. A lot of companies will not modify a watch to have a dial that was not available for a particular version of a watch. In addition, in a recent interview with Thierry Stern, he made it clear that while they will not make custom watches from scratch, it sounded as though they may entertain a good customer requesting that they create a slightly modified watch, his example was a different dial. I don't have the article in front of me but it read as though a person could submit a request to order a particular change to a watch and they would consider it, rather than change the dial of a watch a customer already owned. Mr. Stern raised the issue of not wanting to get into creating one off or individual pieces, that could end up on an auction block in a very short time just because an owner knows they have the only one of a particular model. I would think Patek would want to charge a significant amount if they are accommodating a specific request, as it could become quite valuable as a single piece. However, you suggestion of them doing it at the time of service raises another interesting question, "what happens to the original dial?" Rolex USA keeps original parts, and sells new parts as part of a trade( I hear its not so strict in Europe). Rolex does this to prevent owners from selling old parts on eBay to people that cobble together fakes using some real Rolex parts. In any event, I posed the question about the original dial, because the value of any collectible watch is tied partially to the dial. A watch with original dial is always worth more than one with a "service dial"/replacement, or a redial. So if Patek keeps the original, the owner doing the dial change could be devaluing his watch. Although, if Patek doesn't like doing one offs, that result in watches going to auction after a short time and selling for more than the owner paid, a later dial change after purchased (so its not in its original form) could dissuade an owner from flipping it , because he knows its worth less since its not the original dial and didn't come from the factory that way. I guess the only way to know what Patek would actually do is to submit a request to Patek and wait for their response.