sorry to say, but the new yuki cases are junk (wok haut, glued in crown tube), you ll soon be returning it, search the recent rolex section for explanations, or 'sly' can also tell you all about it.
also i dont see a point in buying a gen movement unless one day you hope to unscrupulously sell it as a gen, IMO its a waste of $1,200 when a fully service and adjusted ETA can match the COSC tolerances. for the same price as a gen movement you can build a visually complete gen 5513 gloss dial watch, sans case.