NH35A vs VK63A: Automatic or Meca-Quartz? Which to choose and why

In the world of artisanal watchmaking, few decisions define a watch's character as much as the choice of movement. At PANTER Watch, we work with two reference calibers: the Seiko NH35A and the TMI VK63A. Each has its own philosophy, its virtues, and its audience. In this guide, we explain the real differences so you can choose wisely.

The Seiko NH35A: the reliability of pure automatic

The NH35A is a 24-jewel automatic movement manufactured by Seiko Instruments (SII). With over two decades of history and millions of units produced, it is one of the most reliable and valued calibers on the independent market.

Key features:

• Type: Automatic (charged by wrist movement)
• Frequency: 21,600 vph (6 beats per second)
• Power reserve: approximately 41 hours
• Accuracy: between -10 and +30 seconds per day
• Second hand: continuous and fluid movement
• Functions: hours, minutes, seconds, date

The NH35A is the heart of our Submariner, Seamaster, Nautilus, GMT, and Yacht-Master collections. Its smooth sweeping second hand is one of the most appreciated details by enthusiasts — a characteristic that only automatics offer.

The TMI VK63A: the precision of Mecha-Quartz

The VK63A is a hybrid caliber developed by TMI (Time Module Inc.), a subsidiary of Seiko. It combines a high-precision quartz motor with a mechanical mechanism that reproduces the fluid movement of the second hand — the best of both worlds.

Key features:

• Type: Mecha-Quartz (hybrid quartz + mechanical)
• Frequency: controlled by quartz oscillator
• Power reserve: long-lasting battery (approx. 3 years)
• Accuracy: ±15 seconds per month (much higher than automatic)
• Second hand: continuous and fluid movement (not jumping)
• Functions: hours, minutes, seconds, chronograph

The VK63A is the movement of our Daytona collection. Its chronograph function and superior accuracy make it the ideal choice for those who value precision above all else.

Direct comparison: NH35A vs VK63A

Which one is yours?

Choose the NH35A if: you value mechanical tradition, enjoy the idea of a watch powered by your own movement, and prefer collections like the Submariner, Seamaster, or GMT.

Choose the VK63A if: you seek maximum precision, want the chronograph function, and are attracted to the Daytona's aesthetic with the fluid second hand that only a mecha-quartz can offer.

At PANTER Watch, both movements undergo the same rigorous quality control process before reaching your hands. Whatever your choice, you'll be wearing a unique piece hand-assembled in Spain.

"We don't mass-produce watches. We build unique pieces for those who understand that time deserves something extraordinary."

— PANTER WATCH LIMITED