Orange Epsom Notched Strap for a Seiko 7B72-0AF0

A corner-notched strap exists because the case will not take anything else. This order was a notched strap for a Seiko 7B72-0AF0, cut to A 24 mm, B 14 mm and C 3.5 mm in orange Epsom. The B figure is the interesting one: 14 mm of notch depth is a long step into the case, and it is the number that decides whether the strap seats or sits proud.

Build sheet

Watch	Seiko ref. 7B72-0AF0
Product	Custom corner-notched strap
Notch measurements	A 24 mm, B 14 mm, C 3.5 mm
Leather	Orange Epsom
Length	75/125 mm (3.0 in / 4.9 in)

Why these choices

Corner-notching is the pattern most people first meet on a Cartier Santos: the strap is cut back at the corners so it steps into the case opening instead of stopping outside it. A is the full width across the strap end, B is how deep the notch runs, and C is how much leather is left standing at the shoulder. Those three numbers are the pattern. We cut to what the customer measures, and if you are not confident with calipers, a jeweler will take them in a few minutes — it is cheaper than a strap that does not fit.

Epsom earns its place on a build like this. It is a stamped-grain calfskin, the leather most people know from Hermès bags, and its virtue here is structural: it is light and holds a crisp edge, so a shape with three cut faces at the case end stays sharp rather than rolling soft. It is also the most scratch-resistant of the calf finishes we stock, which matters on a strap that seats tight against metal.

Orange is the outlier choice and it is the right kind of outlier — a color that reads as deliberate against a steel case rather than accidental. At 75/125 mm the length is unremarkable, which is the point: the whole difficulty of this order lives in the notch, not the fit around the wrist.

Questions we get about this build

What measurements do I need for a notched strap for a Seiko 7B72-0AF0?

Three: A across the strap end, B for notch depth, C for the shoulder left standing. Take them from the case opening with the bracelet removed, and send the figures you actually measured rather than ones copied from a forum post — case tolerances vary between references.

Corner-notched or center-notched — which do I have?

Corner-notched cuts back at both corners, the Santos pattern, and uses A/B/C. Center-notched leaves a tab in the middle and uses X/Y/Z. Look at where the case wants the leather to enter and it is usually obvious.

Notched straps are drawn from your measurements every time, so there is no stock version to compare against. Start on the custom notched straps page, see the corner-notched strap used here, or browse orange leather watch straps. Made to order — allow 2-3 weeks to delivery.