Watch case and strap, in proportion to a wrist

Lay your forearm on a table and look down at the wrist bone. The case of a watch should sit on the flat of that wrist and stop before it overhangs the bone on either side. The stainless-steel chronograph at the top of this essay, blue dial and metal bracelet, is a large sport case. It is an illustration of scale, not a recommendation to chase the same size. Whatever name is printed on the dial, the question is whether that case fits the wrist in front of you. A smaller case is often easier under a shirt cuff. A strap changes the mood of the watch more than a complication does.

This journal does not sell the watch, and it does not treat a watch as an asset. Proportion and ordinary care are the whole subject.

Case and wrist

Diameter is the width of the round case, ignoring the lugs and the crown. It is the figure marketing likes, and on the wrist it is only a start. If the case hangs past the bone, it is too large for that wrist. A case that looks small is a preference. Overhang is the clearer problem. It catches on cuffs.

Subdials on the blue face make a large case look busier. Busyness is not size. A plain dial of the same diameter would overhang by the same amount. Look with the arm relaxed. A flexed pose hides overhang for the length of a photograph.

Thickness matters once the diameter is acceptable. A thick sport case lifts a shirt cuff even when the width is fine. The hero photograph flatters thickness on a table. On a wrist, you notice it every time you type.

Lug to lug

Lug-to-lug is the span from the tip of one lug to the tip of the other, where the strap attaches. Two watches with the same diameter can differ here if one has long lugs and the other short ones. That span has to fit the flat of the wrist. If the lugs ride onto the curve toward the forearm, the strap will not lie flat and the watch will twist.

A page that quotes only a diameter leaves this out. Look at the lugs from the side. They should end on skin that is still relatively flat. If they pass the bone, you want a shorter span, often a smaller case, sometimes only a different lug. You need the watch on your wrist and a mirror, not a caliper.

The knit flat lay below sets a wristwatch beside a beanie, a gray sweater, and jeans. The watch is one object among clothes. If it would dominate that pile, it may dominate your wrist. The photograph cannot give you the millimeters. Your wrist can.

What you look at	Where	A comfortable result
Case diameter	Edges of the case against the wrist bone	The case does not overhang the bone
Lug-to-lug	Tips of the lugs on the flat of the wrist	Lugs end before the wrist curves away
Thickness	Case against a shirt cuff and the back of the hand	The cuff can move, and the case is not perched
Strap or bracelet	Material, weight, and how flat it lies	The watch sits down, and the mood matches the clothes

Strap and bracelet

The hero watch is on a metal bracelet. A bracelet reads as a tool, feels cool, and adds weight. A leather strap on the same case would quiet it. The dial would still be a chronograph. The complication says the watch can time something. The strap says what it is doing in an outfit, and the strap is the stronger signal.

A mesh band, like the watch with the scarves in the next photograph, sits lower and reads closer to jewelry. It lies with earrings and a sculptural bracelet on a white shirt. A heavy sport bracelet would shout in that company. Match the strap to the clothes you wear most often, not to one photograph.

Leather straps do not enjoy daily swimming. A bracelet can be rinsed and dried. Choose the material for the week you have. If the clasp is tight on the last hole, the strap is short. If the tail will not stay in the keeper, it is long.

Under a cuff

Button the cuff of a shirt you actually wear. A large sport case, which is what the blue-dial chronograph represents, often will not slide under a narrow cuff. You leave the cuff open, or you stop wearing that shirt with that watch. A smaller case slides under. That is why a smaller case is often easier with a shirt cuff, even if you like the sport watch on a bare wrist.

Knits forgive more than woven shirting. The gray sweater in the flat lay will stretch over a case a poplin cuff will fight. If your week is buttoned cuffs, try the watch with the cuff closed before you accept the diameter. Test the wrist you actually use.

The crown should not dig into the back of your hand when you write. On a large case it sits farther out. If it stabs, the case is too wide or this is the wrong wrist.

Try the same watch with the sleeve you wear most. A rolled sleeve forgives a sport case. A buttoned cuff asks for less diameter and less thickness. The blue dial and the bracelet can stay aside on shirt days and come out when the wrist is bare. That choice is proportion. It has nothing to do with how many hands are on the dial.

Care that does not involve a toolbox

Wipe the case and the bracelet with a soft cloth. Rinse sweat from a steel bracelet and dry the links. Keep perfume and lotion off the case and off a leather strap. Do not wear leather into the shower.

Do not open the case back at the kitchen table. If a pin walks out of a link, or the crystal fogs, a watchmaker is the next step. A soft cloth is the care you do yourself. A pry tool is a risk to the seal.

• Look down at the wrist and refuse a case that overhangs the bone.
• Check lug-to-lug, not only the diameter printed on a page.
• Let the strap set the mood. The complication is secondary.
• Button a real shirt cuff before you accept a large sport case.
• Wipe the watch. Leave the case back closed.
• This journal does not treat the watch as an asset.

When you want to see current cases and straps, read the descriptions on the merchant homepage and then try the span on your own wrist.

Open the Mr Porter homepageLeaves Rive Gauche Style for the Mr Porter homepage. This placeholder is not an affiliate link.

Mr Porter sets its assortment and its policies, and this journal does not.