For whom?

• Aviation/pros : Pilots or aeronautical enthusiasts thanks to the calculation rule (speed calculations, fuel consumption).

• Occasional athletes : 100 -meter seal adapted to swimming, but avoid diving.

• WORLOGER geeks : Overloaded but functional design, reliable quartz mechanism (difference of ± 20 seconds/month).

See the Casio EF-527D-1Avef and the opinions on Amazon

Design & Comfort

• Housing : 45 mm, thickness 11 mm - imposing (wrists ≥ 18 cm).

• Bracelet : Solid stainless steel, brushed finish with partial polis. Noise noise noted, but precise micrometric adjustment.

• Dial : Complex reading (tight figures), but indications and light needles (high -performance blue lume).

Features

• Slide rule : Useful for conversions and multiplications, but necessary learning.

• Chronograph : Precision at 1/20th of a second, has 12 hours. Functional subdials (hours, minutes, seconds).

• Robustness : Mineral glass (moderate scratches), crown and bottom screwed.

Autonomy

• Stack : Real duration ≈ 2 years, in accordance with promises.

• Interview : Simple replacement (access via screwed background).

Strengths/Weak points

Verdict

Top for piloting enthusiasts or looking for a reliable chronograph Alternative ::

• Citizen Nighthawk (≈350 €): 200 m waterproofing, but higher price.

• Seiko Flightmaster (≈300 €): Same aviation functions, sapphire glass.

If the calculation rule is secondary, favor a Casio Duro (better seal) or Timex Weekender (minimalist design).

Question open to readers ("What do you think of this product? Give your opinion in comment!")

Strengths

• Robustness/waterproofing : Stainless steel and 100 m resistance validated by pool tests.

• AVIA features : Operational calculation rule (nautical conversions, flight calculations) despite a necessary learning.

• Striking design : Blue/orange "Sunburst" dial and brushed finish/Mirror polis appreciated.

• Adjustable bracelet : Full links with micrometric adjustment (+/- 5 mm) for precise adjustment.

• Value for money : 1/20th chronograph of s. and mineral glass at less than € 200.

Weak points

• Clipping : 45.5 mm too imposing box for wrists <18 cm.

• Bracelet : Hollow stitches generating rattling.

• Racked glass : Mineral (not sapphire) with micro-scratches after 2 years of intensive use.

• Readability : Overload of the dial (tight figures, multiple ladders).

User verdict

93% satisfaction (out of 12 opinions analyzed):

• Ideal target : Aeronautical enthusiasts or lovers of technical chronographs with wide cuffs.

• Alternatives cited ::Citizen Nighthawk (≈350 €) for a higher seal.Seiko Flightmaster (≈300 €) for a sapphire glass.

“An unbeatable value for money for a chrono aviation, despite some ergonomics concessions. »»

Your experience interests us!Do you have this watch?

• ➔ What use do you make on a daily basis?
• ➔ Does the calculation rule seem useful to you or gadget?
• ➔ Do you have any tips to alleviate the noise of the bracelet?

Comments open below ↓