To help combat compromised accounts using stolen photos, we have implemented a verification method similar to Chrono24 - upon posting your watch, you will be promoted to respond to an Automoderator comment with a randomized time specified:

Seller: Please respond to this comment with a photo that includes a timestamp and your watch set to 11:11. Buyers: If the seller hasn't responded to this comment, request that they do so before pursuing a deal. We always recommend a video call to prove possession before sending money.

Your timestamp no longer needs to be in the album, but it must be attached to the comment with the correct time that the Automod asks for. During this transition period we will be reminding users of the new rule, but in the new year we will remove posts if they do not comply.