Unitas Eta Caliber 6497 Vs 6498 Difference

ETA Unitas Caliber 6497 VS. 6498


Unitas Eta Caliber 6497 Vs 6498 Difference

What is the difference between ETA/Unitas caliber 6497 and 6498?

Both movements are based off of pocket watch movements. Both movements are found in many modern day pilot/flieger watches. Both movements were introduced in 1950 and are still being manufactured today. This is only one major difference…

Caliber 6497Caliber 6498
OriginSwiss madeSwiss made
Year Introduced19501950
Diameter16.5”’ (36.5mm)16.5”’ (36.5mm)
Power Reserve46-50 Hours46-50 Hours
Beats Per Hour18,800/21,600 vph18,800/21,600 vph
CrownCounterclockwise to set timeClockwise to set time
Anti-Shock SystemIncabloc (or none)Incabloc (or none)
Small Seconds Location9:006:00




The major difference between the Unitas/ETA caliber 6497 and caliber 6498 is the location of the small seconds subdial.

Sub seconds placement, that’s all folks!

Imagine these watches as the were intended: as pocket watches. The 6497 would be in a Lépine (open face) pocket watch with the crown up. The 6498 would be the movement in a hunter style pocket watch with the crown to the right. Both would have the seconds at the 6:00 mark, but changing the crown position by 90 degrees would change the seconds position as well. When used on a standard wristwatch, this gives two options for the seconds placement when designing the dial.

Part Interchangeability

There are some differences in parts as well. This was outlined by lysanderxiii on wus:

The 6497-1 and 6498-1 (same for the -2) do not share commonality in the following parts: (all others common)

  • Mainplate
  • Barrel Bridge
  • 3rd Wheel
  • 4th Wheel
  • 4th Wheel (no second pinion)
  • Stem
  • Set Lever
  • Setting Lever Jumper
  • Yoke (-2 variants only)

Which one is more popular?

Do you know of more pilot watches with the small seconds at 6:00 or 9:00? It seems that there are more 6:00 subdials out there, making the 6498 more popular. However, with that said, you may find that more listing mix these movements up and list most watches as having the 6497 without actually knowing the difference. Hopefully this post will change that!

What is the difference between calibers with “-1” or “-2” at the end?

Click here to read more on that.

Have you noticed any other differences? Please comment below.

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6 years ago

[…] Read more: Differences between the 6497 vs 6498 […]

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[…] The caliber 6498-2 is often mixed up with the ETA/Unitas 6497-2. The main difference between these two calibers is that the 6498 has the seconds subdial at 6:00 and the 6497 has the seconds at 9:00. Click here to learn more. […]

Krisztian Olah
Krisztian Olah
5 years ago

Both movements are 6497 on the picture, just the right is rotated 90°.

4 years ago

[…] steel) 42mm case diameter 22mm lug width The movement is an ETA Unitas 6497/6498 manual wind. ( ETA Unitas Caliber 6497 VS. 6498 Watch Movement | CaliberCorner.com ) These are pocket watch movements that were repurposed to wristwatches when they started to get […]

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I have an Elgin “Swiss” sized 10 pocket watch from the early 60’s that has the Unitas 6497 movement. And the watch has the seconds sundial at 6 o’clock. What say you?

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