What is the difference between Seamaster 1503-825 and 1504-826 (links) - they look identical

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I have some 1503-825 and 1504-826 (links) that came from a couple of Seamasters and I wanted to know if there was some way to tell them apart?

From everything I can see - they look absolutely identical to me.

Perhaps an Omega expert could enlighten me or point me in the right direction.

Thanks in advance.
 
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They are the same, the enbd piece marked 826 is thicker and covers more of the case than the 825...the 826 is standard for the Chronograph
 
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Necrothreadia!! This thread is from 2014 and the OP hasn’t been here since 2014! Welcome to the forum.
 
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Thank you for the welcome, I know its necrothredia but it was unanswered and I felt that the answer could have some potential benefit to some other lost and weary traveler seeking knowledge of things Omega