G'Day ! Well, I have a question, it is regarding the PRIM cal 684 (? 68.4 not quite sure, as the marking on the movement is not quite clear). Namely, I need information about the balance staff, either the replacement equivalent from Ronda or the actual sizes so that I can find an equivalent or if none then to turn a new one. The staff is shockproof KIF S. Thanks in advance! Cheers Dushan