THE PRICE ITS FIXED . 2x Printed Manuals for Services for the Watchmakers - LANDERON Chronographs Cal. 48 + Cal. 51 ( 90 pages with detail illustrations ) - VENUS Chronographs Cal. 150 + Cal. 170 ( 115 pages with detail illustrations ) . Manuals for Technical Services For advance users / watchmakers and watch collectors, or fans that like to understand in detail the: Functions / Oiling / Advance Adjustments For advance users and any watch collector, or mechanical watches fans that like to understand in detail the fine adjustments of the chronographs parts . bergeon longines tissot iwc zenith longines boley hamilton valjoux omega