Hello!
Just a quick question: I want to install an exhibition case back in my Speedmaster FOIS, but I don't know if that could annul my 5 years guarantee (4 & 1/2 years left).
I don't have Omega stores near my city, and this particular job I can do it on my own or with local watch repairer.
Thank you in advance for your replies and greetings from Spain.

 

if you can open watch without leaving a mark and swap original caseback back in case of potential warranty claim, how do they tell you've done something?

I recommend sticky ball by the way

 

From the t&c's that ive read in the past relating to watch warranties, i think it would void the warranty, especially if you raised a subsequent claim after switching over to the new case back.

 

I have an noughties era Speedy and there is a distinctive red paint like dot which has been marked on the case and screwdown caseback. On a watch such as that I suppose it would be easy to tell. Not sure if there are any fancy, modern ways they can tell.

 

Wait 5 years, then change it. There's no point invalidating a warranty.

 

I really don’t know if they still mark casebakcks with red dot. Haven’t seen them long time. Even then first half on first sentence applies

 

Those red dots are no longer used.