The BALL Trainmaster Worldtime Chronograph combines an automatic chronograph with a rotating city disc for world time across 24 geographic zones. The model-specific published description identifies reference CM2052D-LJ-BK and a BALL 352 automatic caliber based on ETA 7750 with an added world-time module. Those specifications explain the watch’s appeal, but they are not a substitute for hands-on testing: the available sources do not establish its accuracy, comfort, current price, or present availability.
How the world-time display works
Instead of relying on a separate 24-hour hand, this Trainmaster uses a rotating disc engraved with major city names. WorldTempus reports that a special module turns the disc automatically in the direction opposite the watch hands, indicating the time in 24 geographic zones. The city names provide a way to relate the watch’s time display to different parts of the world; the source does not explain the precise setting procedure for this reference.
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The arrangement is distinctive, but its practical value depends on being able to read the city disc alongside the hands. No independent usability test or detailed dial-legibility assessment is available, so the published description establishes how the mechanism is intended to work, not how quickly every wearer can use it.
Chronograph and other functions
WorldTempus reports an automatic BALL 352 caliber, described as an ETA 7750 movement with a special module added to drive the world-time disc. Listed functions include hours, minutes, subsidiary seconds, day and date, plus a chronograph with accumulated measurement up to 12 hours. The 12-hour figure is a published model specification, not an independently verified timing result.
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The combination gives the watch two distinct jobs: tracking elapsed time with the chronograph and showing world time through the city disc. Whether that is more useful than a simpler travel watch depends on whether you regularly use both functions and find the dial clear enough to read. There is no independent accuracy, durability, or performance testing to support a broader verdict.
Published specifications and configurations
| Item | Reported details |
|---|---|
| Reference | CM2052D-LJ-BK, as identified by WorldTempus. |
| Movement and display | Automatic BALL 352; WorldTempus describes a module grafted onto an ETA 7750 to drive the world-time disc. |
| Functions | World time across 24 geographic zones; chronograph with accumulated measurement up to 12 hours; hours, minutes, subsidiary seconds, day and date. |
| Case | Stainless steel; 42 mm diameter and 13.7 mm height. |
| Crystal and back | Anti-reflective sapphire crystal and sapphire display back. |
| Crown and water resistance | Screw-in crown; published rating of 50 m/160 ft. This rating alone does not establish dive-watch suitability. |
| Low-light elements | 15 tritium micro gas tubes on the hands and dial, according to the model description. This is a construction detail, not a comparative brightness test. |
| Reported options | WorldTempus describes black or white dials with a crocodile leather strap. A retailer separately lists a CM2052D-SJ-BK variant with a stainless-steel bracelet; confirm details for the exact watch being offered. |
These are model specifications reported by WorldTempus in an article published approximately in 2012; they should not be read as current testing or confirmation that every variant shares every detail. WorldTempus’s Trainmaster Worldtime Chronograph description is the source for the core movement, complication, case and display details.
What it may offer travelers and watch enthusiasts
For travelers
The rotating city disc is the central travel feature: it is designed to show time across 24 zones, while the chronograph can time events up to the reported 12-hour accumulated limit. The appeal is greatest for someone who wants both functions in one mechanical watch and is comfortable reading a city-based display. Because the available description does not document the setting steps for this specific reference, buyers should not assume that instructions for another BALL watch apply.
For watch enthusiasts
The added world-time module on an ETA 7750 base is the most technically notable aspect of the model description. The rotating city disc gives the watch a different approach from displays that use a dedicated 24-hour hand. The reported 42 mm diameter and 13.7 mm height are useful fit considerations, but they cannot establish how the watch wears on a particular wrist, especially across different strap and bracelet versions.
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The 15 tritium micro gas tubes are also a noteworthy construction feature for low-light reading. Their presence does not, by itself, show that this watch is brighter or more legible than another model; no controlled comparison is available.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What to verify before buying
Current price, stock, service cost and present marketplace availability are not established by the sources. The retailer result is not a reliable basis for a current price or inventory claim. Treat a remaining-stock or pre-owned listing as an individual purchase that needs verification rather than assuming a particular configuration or condition.
- Match the reference on the watch and its documentation to the seller’s listing. CM2052D-LJ-BK and CM2052D-SJ-BK are distinct reference strings reported in the sources.
- Confirm the actual dial and whether the watch comes on a leather strap or stainless-steel bracelet; do not infer one configuration from another reference.
- Request available authenticity and service records, and assess condition from clear photographs or an in-person inspection.
- Check the seller’s return policy and any warranty terms before purchase.
WorldTempus’s specifications are the basis for the model details above. A separate retailer result identifies the bracelet version but does not establish current availability or pricing: Chrono24 listing result.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
