Inherited 40mm Seamaster Pre Bond - is this a 1441 or aftermarket movement?

Hi all,

I’ve just joined the forum and have a question about a movement if that’s ok?

I’ve tried my best to research everything by myself, but i’m really struggling with this one! I’m hoping a keaner eye could help me out.

I’ve inherited some Omegas. I know little about watches, but have tried my best to learn. I’ve had them all serviced. During servicing (and out of intrigue really!) I asked the gentlemen to let me quickly photograph the movements.

They all seem correct to me, apart from what I understand to be a pre-bond Seamaster 200. I believe it to be a ‘jumbo’ model (around 40mm case) and I’m led to believe these had a 1441 movement.

However, looking the photographs and comparing them to 1441 movements online, the ‘layout’ seems correct, but some things ante not exact. For example, the little omega plate is blank. Annoyingly, my photo makes the number difficult to read, but it is something like 255/56 255/66 255/36.

I’ve found in this post someone asking a similar question: https://omegaforums.net/threads/is-this-the-omega-1441-replacement-the-eta-255-561.21394/, Where the responder believes it would be unusual for an aftermarket movement to be laid out so similarly to an original 1441.

I just wondered if anybody could help me confirm whether this is or isn’t an aftermarket movement please? Or if there is anything else ‘off’ for you.

Photos added.

Any help would be hugely appreciated.


Many thanks

Edit: after examining one of the photos more closely, it definitely reads 255561 (I hadn’t favourites that one!)

I really appreciate your response.

Just so I’ve understood - does that mean that this is not the original movement, but likely a good quality replacement - or were these early versions shipped with these eta movements?

I’m sorry for my basic questions.

Of the watches I’ve received, I am balancing up which ones to retain. As I beleive this one is from near my birth year (1988), I’m tempted to keep it if it’s original. It is well worn, but I really quite like that about it.

Ok, understood. Thanks for your knowledge and input! I know what I’ve got now.