I came across an Omega Railmaster 2503.52. It comes with original box (damaged) and full 898 Aqua Terra stainless steel bracelet (all links included).
The seller has disclosed it has non-matching serial numbers on the case and movement since the original calibre 2403 movement was replaced due to mechanical issues. It was replaced with an Omega calibre 1120 which is running approximately -6 seconds per day.
I am somewhat familiar with Omega models but I am not at all smart on movements. Is this watch even worth the money if it can be had at a good price? Any concerns with it being replaced with an older(?) movement? Appreciate any feedback.