Guarantee Booklets - early 1950s to mid 1950s Serial Numbers Size  Watch Models ca. 700K to ca. 1M and 0* to ca. 300K *circa Q4 1953  Rolex restarted their serial numbers. 4" x 7.25" 10,2 x 18,5 cm All Watch Models from the early 1950s to mid 1950s: 6610, 6541, 6202, 6536,6200, 6204, 6205