Hi, I am hoping to buy a omega speedmaster 3572.50 to start my collection I have found a watch online that I am very interested in (photos attached) However, I noticed on the display back that the movement has a gold wheel on the top right. I know the sapphire sandwich models have a gold wheel in that position but almost all the 3572.50 I have seen have a rhodium grey wheel in that position. (photo for comparison also attached) Is it possible for a 3572.50 to have a gold wheel in that position or has it been altered? If it has been altered does that diminish its value or imply it may be a fake? Other general comments about the watch also very much appreciated Thank you!
The wheel in the coupling yoke is sometimes gold tone, and sometimes silver tone. I've never noted a correlation between the colour of this wheel and a specific model. It looks fine to me.