Casio Edifice EF527D-1AV review + link to video review

Main features of this watch are a quartz movement, slide rule bezel, 12-hour chronograph, and screw down crown and case back

Case of the watch

The case is made from polished stainless steel.
Diameter: 42 mm
Height: 11 mm
Weight: around 150 gr with two links removed.


The bezel on this Edifice is fixed, but it does have an internal rotating bezel/reflector. The reflector and outer edge of the dial have the slide rule scale.
The slide rule is basically a scale based on logarithms, so you can do basic division and multiplication as well as time/distance calculations and such.

My most common use is for quick currency conversions
The internal bezel or reflector is rotated be using the turning knob at the 8 o clock position. The turning action is very smooth, and easy to adjust the slide rule. On the negative side the turning action is much to easy for my preference, and if you like having the slide rule perfectly lined up when not in use, this is not the watch for you.


Here you can see the dial of the edifice. The dial it self is black and is quite busy like most slide rule watches.
As mentioned before, the scales on the dial that run along the edge of the dial are used for slide rule functions.
The large red second hand is a part of the chronograph and is therefore stationary unless you engage the chronograph.

The top sub dial is the minute marker for the chronograph

The 9 o'clock sub dial is hour indicator for the chronograph, and counts up to 12 hours, a nice feature for an inexpensive analog quartz watch, since they often only have 30 minute or 1 hour chronographs.

The sub dial at the six o’clock position has a double function, it acts as the normal seconds counter for the time keeping of the watch, since the large second hand is only used for the chronograph. When you use the chronograph the 6 o’clock sub dial stops counting seconds and becomes a 1/20th of a second indicator, and it runs constantly for the first 30 seconds, and becomes stationary after that, but jumps into the right place when stopping the chronograph.

As you can see there are actually two time scales on the sub dial, the seconds on the outer scale and 1/20th of a second on the inner scale.


The lume of the watch hands is not bad at all, and can actually be readable for a few hours after a good exposure to light, the lume of the hour markers lasts shorter, and is a bit weak. Definitely not the worst I have seen, probably about average or a little bit better than average.
The hands on the sub dials are not lumed.


Top button to start and stop, the lower button to reset the watch, but there are no lap functions.

After resetting the chronograph, the time keeping second hand will be stopped and ready for use in the chronograph. Simply push the lower button again to let the it resume its second hand function, or just leave it stopped, it wont affect the time, keeping of the watch


The crystal on the watch is a flat mineral crystal, and is flush with the bezel of the watch.

Case back

Screw down case back, with the Casio edifice logo, the module (movement) number and other information.


Screw down, signed crown between 5 and 6 mm, not the best grip but well usable.


Stainless steel bracelet
Brushed and polished surfaces
Push pin design, and folding clasp with a safety.
No divers extension.
22 mm at the lugs but tapers down to around 20 mm near the clasp
End links are hollow.

Alternative straps

I think that there is nothing wrong with the bracelet of the watch, and its basically pretty nice. However I think that due to the very busy dial of the watch that the watch actually looks better on a black leather strap or Isofrane than a stainless steel bracelet.


This Edifice is a relatively inexpensive watch featuring a slide rule bezel, 12 hour chronograph, and screw down crown with water resistance of 100 meters. The watch looks surprisingly good, especially on a black strap.
The watch has been keeping good time, and runs 10-15 seconds fast per month (typical quartz accuracy). The slide rule has minor inaccuracies but is still well usable, and the hands are aligned well to the markers on the dial.

The review is finished, but below is some information regarding a slide rule bezel if readers are interested.

I use the slide rule is mostly for a crude currency converter.

Say you want to convert between euros and US$.

Right now one euro is close to 1.3 US$, or in other terms one euro is worth 1 dollar and thirty cents.

You would line the 13 with the 10, the 10 representing our euro and the 13 representing our US$

This also means that 1 euro is 1,3 US$, 100 euros are 130 US$ and so on.

Now you can glance at a number on the inner scale (euro) and look at the number on the outer scale to see the conversion to US$

You have to keep track of the zeros, so if you are converting from 230 euros and look at the 23 on the inner scale, you can see that the outer scale reads somewhere around 30 but obviously 230 euros are not 30 $, but closer to 300.

The 13 can also represent:





13000 and so on

The 10, that can also represent







1000 and so on.

Below are a few sources for information about how to use slide rule bezels, enjoy.

Seiko instructions for use of a slide rule.

A nice article on a blog to read

And a couple of videos from youtube on the use of slide rule bezels.


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