How exactly "case size" measurement is determined?

# Thread: How exactly "case size" measurement is determined?

1. ## How exactly "case size" measurement is determined?

On many of the sites when describing the watch it will say for example case size - 43mm wide x 13 mm thick.

Others will say "dial size" "case diameter" etc.

Is the way in which they measure different for every watch and whoever is selling it?

In general, when they're describing the case size, is it the entire width from side to side including the knob for setting the time? Or is it the diameter of the dial itself? Bezel included or not?

It seems confusing and difficult to determine exactly what the measurement refers to precisely.

Thank you.

2. ## Re: How exactly "case size" measurement is determined?

Not confusing or difficult to me. In my understanding (and experience) it´s always the diameter of the case incl. bezel excl. crown.
The dial diameter doesn´t play a role because it is always smaller. The lugs don´t play a role too.

3. ## Re: How exactly "case size" measurement is determined?

Well Mike the lugs play a role length wise.
On a large watch it's wise to know the lug to lug length.
It's silly looking I think when a watch overhangs one's wrist.

4. ## Re: How exactly "case size" measurement is determined?

Originally Posted by Tragic
Well Mike the lugs play a role length wise.
On a large watch it's wise to know the lug to lug length.
It's silly looking I think when a watch overhangs one's wrist.
I know, but the lug to lug length isn´t the diameter.

5. ## Re: How exactly "case size" measurement is determined?

I've noticed that not many people worry about case area, particularly with regard to tank, tonneau and cushion cases. I recall one discussion in which somebody, on hearing that the Vostok Attache was less than 40mm wide concluded that it was too small for his manly wrist He didn't stop to consider the surface area of a rectangle in comparison to a circle of the same width.

6. ## Re: How exactly "case size" measurement is determined?

I've been under the impression that measuring on the 8-2 diagonal gives the "truest" measure of outside dimension of the case when considering round face watches. That coupled with the lug to lug dimension gives a good XY ratio.

7. ## Re: How exactly "case size" measurement is determined?

I thought I'd revive this thread because I have this same question and am still unclear as to how to measure a watch. Let's say I take a diving watch where the case juts out a bit at the 9 o'clock position as well as where the crown inserts to. Do I measure from the widest part of the case (9 o'clock) to the opposite side?

8. ## Re: How exactly "case size" measurement is determined?

Originally Posted by boneycat
I thought I'd revive this thread because I have this same question and am still unclear as to how to measure a watch. Let's say I take a diving watch where the case juts out a bit at the 9 o'clock position as well as where the crown inserts to. Do I measure from the widest part of the case (9 o'clock) to the opposite side?
I´d do so. Don´t know what the manufacturer did

9. ## Re: How exactly "case size" measurement is determined?

I'm no expert, just passing along what I've seen and read in a few places...the most common method I've read in determining the basic case size is to measure on the outside of the case with calipers along a diagonal from the 8 o'clock to 2 o'clock position, or from the 10 o'clock to 4 o'clock position -- the specific position you choose is determined by where the crown is located...you don't want to include the crown in the measurement. Some people do take a second measurement including the crown as well, and I've seen it quoted as "case diameter including crown", which I suppose is useful if you need to know the absolute maximum width of the watch as it sits on your wrist. I'm not sure how they work out the measurements if it's a chronograph with pushers - perhaps they alter the diagonal a little bit to miss them...point being, the case measurement is supposedly what the diameter of the case would be if nothing was sticking out of it.

Case thickness seems to be similarly confusing - supposedly, you measure with a caliper from the highest point on the front of the watch to the highest point on the caseback, but again there are variations I've seen, depending on whether the bezel ring is higher than the crystal (as on some dive watches), or other measurements like "crystal thickness" which seem a little dubious.

I agree on the lug length comment - it's important to understand that measurement, especially if you have a smaller wrist and don't want something sticking out.

Hope this helps...
Mike

10. ## Re: How exactly "case size" measurement is determined?

Originally Posted by mjbernier
I'm no expert, just passing along what I've seen and read in a few places...the most common method I've read in determining the basic case size is to measure on the outside of the case with calipers along a diagonal from the 8 o'clock to 2 o'clock position, or from the 10 o'clock to 4 o'clock position -- the specific position you choose is determined by where the crown is located...you don't want to include the crown in the measurement. Some people do take a second measurement including the crown as well, and I've seen it quoted as "case diameter including crown", which I suppose is useful if you need to know the absolute maximum width of the watch as it sits on your wrist. I'm not sure how they work out the measurements if it's a chronograph with pushers - perhaps they alter the diagonal a little bit to miss them...point being, the case measurement is supposedly what the diameter of the case would be if nothing was sticking out of it.

Case thickness seems to be similarly confusing - supposedly, you measure with a caliper from the highest point on the front of the watch to the highest point on the caseback, but again there are variations I've seen, depending on whether the bezel ring is higher than the crystal (as on some dive watches), or other measurements like "crystal thickness" which seem a little dubious.

I agree on the lug length comment - it's important to understand that measurement, especially if you have a smaller wrist and don't want something sticking out.

Hope this helps...
Mike
Nice post. I think you got at what the OP was trying to find out about. You caught all the pertinent details.

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