Rolex 18ct cushion Oyster question...

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Hi,
Just acquired this 32mm 18ct yellow gold mid case Rolex Oyster cushion cased with rose gold screw on caseback and bezel. The inside of the caseback has a plate inside as I think it has worn very thin.
My question is did these ever come with the mixture of Rose and Yellow gold as described?
The crown does not have a screw down crown but a normal crown that fits over an 18ct unthreaded case pipe.
Any help or thoughts would be greatly appreciated.
Cheers Russell.