Did a quick search and couldn’t find anything. If a second hand (or grey market watch) comes with the existing omega warranty - are there any issues (assuming it’s legit)??
No issues. Read the fine print, some websites like Jomashop will not give you the manufacture warranty. Some (like Jomashop again) give their in-house warranty which can be VERY hit or miss so do your research. Best to have the manufacture warranty in most cases unless you get a smoking deal. Saving money is never a bad thing
To service an Aqua Terre with only a date complication at an Omega Boutique in Texas is $550 plus tax. With the service they provide a two year warranty and accuracy within 3 seconds per day. Say your gray market warranty was a total bust you could always take your watch to an Omega Boutique for service and if your gray market savings was greater than the cost of an Omega Boutique service you would still be coming out ahead.