Obvious irregularities were already a clear sign of a problem case. However; help is at hand due to the fact that most of the early Oysters were sold in the UK they bear British hallmarks because it was a legal prerequisite for all precious metal items sold in Britain to be hallmarked by a government department. When the number clocked the , mark the Rolex company decided against turning the number into 7 digits figure and started the numbering all over again and watch enthusiast and historians believe that the real numbering started from 10, or even lower. This should only be done by an experienced watchmaker to prevent scratching the case or bracelet.
July-September of this code continued until around Although Rolex has made very few battery-powered quartz models, the company's engineers were instrumental in design and implementation of the technology during the early s. In the U. In the early s, Rolex once again reached the , mark, but this time added a 7th digit and continued into the "millions" until mid , when the numbering reached 9,,