I just bought this Omega Seamaster Cal.503 rose gold with red second hands. But, I am not sure about the originality for red second hands. Please help me to identify Thankyou so much for your help. Appreciate !

 

I am pretty sure that the Seamaster references that some times come with a red seconds hands aren't Calendar versions, so I'd say that yours is a replacement. Could have been done at the same time the dial was refinished.

I love these cases in gold cap

 

Thanks a lot for your help!