Again we see a lot of options, again a very nice look. It is a direct pattern [which cannot but rejoice] … Black models received an ionized bracelet and a case, which creates a unique effect of darkness [invented it themselves]. That’s all with technology, then we have an ordinary quartz watch with typical [as for Casio hands] functions: date, 1 second stopwatch c [attention! and a light banter] with a measuring capacity of 29’59 [there is also the elapsed time, split time, the time of the first and second place], three additional windows [minutes, seconds and 24 hours of the stopwatch].
Important Information
- Year of first Release — 2015
- Module Number — 5451
- Model Range — STANDARD ANALOG
- Battery Type — SR920SW (Edifice Batteries)
EFR-543 Model Range *may be updated
EFR-543BK-1A9 EFR-543BK-1A8 EFR-543BK-1A4 EFR-543BL-1A 
EFR-543BK-1A2 EFR-543RBM-1A
The most distinctive specs of EFR-543 *Editorial
— 100-meter water resistance (good for swimming but not for deep diving)
— Stopwatch (Measuring capacity: 29’59, Measuring modes: Elapsed time, split time, 1st-2nd place times)
— Multi layered dial (information on the dial is placed in several layers for cool and 3D look)
— 3-years battery
— Date display (adjustable, 31 days or easy manual correction)
Official EFR-543 Specs / Features *for base version EFR-543BK-1A2V
- Case / bezel material: Stainless steel
- One-touch 3-fold Clasp
- Stainless Steel Band
- Mineral Glass
- Screw Lock Back
- Black ion plated case
- Black ion plated band
- 100-meter water resistance
- 1-second stopwatch
Measuring capacity: 29’59
Measuring modes: Elapsed time, split time, 1st-2nd place times - Date display
- Regular timekeeping
Analog: 3 hands (hour, minute, second)
3 dials (stopwatch minutes, stopwatch seconds, 24-hour) - Accuracy: ±20 seconds per month
- Approx. battery life: 3 years on SR920SW
- Size of case : 54.5×46.6×12.8mm
- Total weight : 172g
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