Seiko 5 vs Tissot PRX

The two watches, spec by spec

The 80 hours is bought, not invented

The Powermatic 80 is a 2013 development of the ETA 2824-2, and the references record exactly how the reserve was tripled: the frequency was reduced from 28,800 to 21,600 vibrations an hour and the escapement was changed for a synthetic one. A slower balance consumes the mainspring more slowly, so the same barrel runs far longer. That is a genuinely clever engineering trade and 80 hours is a real, useful benefit — a watch you take off on Friday is still running on Monday.

But the trade has a consequence Tissot does not advertise: the sweep of a Powermatic 80 and the sweep of a Seiko 4R36 are identical, six beats a second. If you are buying Swiss partly for the smoothness of the seconds hand, you are not getting it at this price. The full movement breakdown is in Powermatic 80 explained and the mechanics of the trade in watch beat rate explained.

The asymmetry in what the two makers publish

Seiko publishes a single 4R-family specification: 21,600 vph, automatic winding with a manual-winding mechanism, approximately 41 hours, and +45/-35 seconds a day worn on the wrist at 5 to 35°C. Tissot publishes 80 hours and no daily rate at all. Neither position is dishonest, but they are not symmetrical, and a buyer should know which one they are choosing.

The structural version of this observation — the Japanese publish a tolerance and the Swiss publish a reserve — is the subject of Japanese vs Swiss automatic movements, and the ranked consequence is most accurate automatic watches under $500, where no Tissot can appear for exactly this reason.

Fit, and the thing nobody warns you about with integrated bracelets

The PRX is 40mm against the Seiko's 42.5mm, and it is the better-fitting watch for most wrists. Seiko publishes 46.0mm lug-to-lug for the SRPD63, which is friendly for its diameter; Tissot publishes no lug-to-lug for the PRX, so the only reliable way to judge it is to try one.

The integrated bracelet is also a lock-in. There are no lugs in the conventional sense, so you cannot put the watch on a NATO for the summer or a leather strap for a wedding — you are buying one look, permanently. The Seiko's 22mm lugs take any strap in the world for twenty dollars. How to change a watch strap covers what that flexibility is worth, and best integrated-bracelet watches under $500 ranks the field if the look is what you are after.

The service bill, which is the real long-term gap

A Swiss automatic costs more to maintain than a Japanese one, and the gap widens over the years you own it. Seiko publishes a US service tariff; Swiss service pricing is quoted per watch and we will not invent a figure for it. The arithmetic — including the honest point that an affordable automatic can reach the stage where a service costs more than the watch is worth — is in what a service costs and how long do automatic watches last.

Who should buy which

• You want the integrated-bracelet look and the 80 hours → the Tissot PRX. It is the better-finished watch and the design is the reason it sells.
• You want the most watch per dollar → the Seiko 5 Sports, with a published rate, 100m, a strap you can change and change back, and roughly half the money left over.
• You want the look for the Seiko's money → the Citizen Tsuyosa: sapphire, 40mm, an in-house caliber — but 50m and no published screw-down crown.