Hello - this listing is for  VINTAGE LARGE TRENCH ROLEX ROLCO 15 JEWELS -SPARES REPAIR 

balance wheel sluggish

size approx 29mm  not  including crown ,some  marks tarnishing throughout commensurate with age pictures form part of description no returns

Please note - I am not a Horologist, I am a hobbyist who collects and sells watches. I do the best I can to describe each watch.