Timex case backs vary significantly depending on the era and product line. Vintage mechanical Timex watches from the mid-20th century typically feature stamped case backs with model numbers, the Timex name, and often 'WATERPROOF' or 'WATER RESISTANT' markings. Many vintage Timex case backs also indicate the country of manufacture, which changed over the decades from 'MADE IN USA' to various international locations as production shifted.
The case back material and construction can also provide clues about a Timex watch's era and model tier. Earlier Timex watches often used chrome-plated base metal cases, while later models increasingly incorporated stainless steel, resin, and other materials. The style of the Timex logo on the case back has also evolved, and comparing it to known examples from specific eras can sometimes help with dating. Some vintage models feature snap-on case backs, while others use screw-down designs.
Modern Timex case backs typically display the model reference number, water resistance rating, battery type (for quartz models), and country of origin. Special edition and collaboration models may feature unique case back designs or engravings. As with all watches, case back markings on Timex pieces can potentially be worn, polished away, or altered over time, particularly on vintage examples that may have been serviced or refurbished.