Tissot PRX 35mm T1372071109100: specifications and what to check

Two sizes, two bracelets, no interchange

The most expensive mistake available on this reference is assuming its bracelet is the one from the 40 mm.

Tissot publishes them separately:

• 35 mm — bracelet T605047605, attachment 11.00 mm
• 40 mm — bracelet T605046447, attachment 12.00 mm

One millimetre of difference is enough. On an integrated design the bracelet is shaped to the case, and a bracelet that is a millimetre wrong leaves a visible gap or fouls the case edge.

So at the buy: read the reference on the bracelet, compare it to the reference on the watch, and confirm the end links sit flush against the case with no light showing through the join. On a used watch that has been apart, this is a real possibility rather than a theoretical one.

It also means a spare bracelet you happen to have for one size is worth nothing to the other.

Genuinely square

The published dimensions are 35.00 mm wide by 35.00 mm long — equal in both directions.

The 40 mm reference is 40.00 wide by 39.50 long, which is slightly taller than it is wide.

That is a small difference on paper and it matters when you are writing a description, because "35 mm" here means the case really is 35 mm in the direction that determines how it sits on a wrist. Lug-to-lug and width are the same number.

The thickness, though, is not scaled: 10.93 mm, exactly the same as the 40 mm automatic. A smaller footprint with identical height sits proportionally taller, which is worth mentioning to anyone cross-shopping the two.

A hundred and four grams

The complete watch weighs 104.00 g against 138.00 g for the 40 mm.

Thirty-four grams is a third of the difference again, and weight is the property a buyer notices first when they put a watch on. It is a better answer to "which one should I get?" than diameter is, and it is published, so there is no reason to leave the buyer guessing.

The rest of the sheet

Swiss automatic, 80 hours, patented Nivachron balance spring, and a date — the same movement description as the larger automatic, and, as there, with no calibre name, jewel count, frequency or accuracy figure published.

Describe it as Tissot does and no further.

The see-through caseback is present, which is how you confirm at a glance that you have an automatic rather than one of the quartz references in this collection.

Crystal is sapphire with one antireflective coating on the bottom side — inner face only, so interior haze is a replacement.

Water resistance is given as 10 bar (100 m / 330 ft). Tissot describes no threaded crown on this page, so the seal rests on the crown sitting fully home. Dial green, index markers, Super-LumiNova on the hands. Made in Switzerland, two-year warranty from new.