Most of what goes wrong with an order in this category traces back to one of two details. Neither is complicated, and both are on the product page already.
Reading glasses are ready-made strengths
We do not dispense prescriptions and we are not opticians.
A watch is never included with a strap
Anything else in the photograph is there for scale.
Why we publish it this way
Lug width in millimetres is the first thing we check on a strap listing, because a 20 mm strap on a 22 mm lug is the single most common ordering mistake in this category.
A blank field on one of our pages is deliberate. It means the supplier did not give that number, and inventing one would be worse than leaving it out.