Eta 6498 1 Mechanical Movement

ETA/Unitas Caliber 6498-1

Eta 6498 1 Mechanical Movement

Caliber Number6498-1
Base Caliber6498
4.5mm thick
Vibrations Per Hour18,800 bph
Lift Angle
44 degrees
Power Reserve46 hours officially (some claim 48, up to 53 hours)
FunctionsCentral hours; central minutes; small running seconds subdial at 6:00
Hacking Seconds?No
Country of ManufactureSwitzerland
Known Models
Votum Blue Ocean, too many to list (add your watch in the comments below…)

The ETA/Unitas caliber 6498-1 is part of ETA’s Mecaline Specialies line of movements. It is a hand-wound or manual-wound movement and is considered to be one of the most common mechanical calibers on the market. This is essentially a pocket watch movement that has been adopted by the wristwatch.

6498-1 vs 6498-2:

The main difference between the 6498-1 and the 6498-2 is that the -1 beats at 18,800vph while the -2 beats at 21,600vph. Click here to learn more.

6497 vs 6498:

The caliber 6498-1 is often mixed up with the ETA/Unitas 6497-1. 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.

Power Reserve:

The official power reserve rating on the 6498-1 is 46 hours. You may see others claim a 48 hour power reserve, even up to 53 hours. This could be due to a different configuration depending on the watch brand, or ETA simply used 46 hours as a guide for the lowest power reserve to expect from a full wind.

How many turns of the crown until fully wound?

Unlike some other movement manufacturers, ETA does not clearly define the number of turns needed to take a cal. 6498-1 from 0 to full power reserve. Perhaps this is due to the fact that technically the number of turns may vary depending on the crown size. In an effort to start crowd-sourcing this information, a few sample 6497-1 based watches were used to count the number of clicks from a stopped state until the movement could not be wound further. The results were as follows:

ETA 6497-1:


All examples have 56 teeth on the ratchet wheel.

Maybe not the best experiment, but interesting enough. Will test these again and update if there are any differences. If you wish to join this experiment, please comment below with your watch and how many clicks you counted from 0 to fully wound.


Extra Information:

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Ed Sadler
Ed Sadler
3 years ago

This is my favorite movement. I love winding it. Currently have a Dufrane Bergstrom with one, but it’s not as nicely finished as the one pictured here.

New Watch Alert: 3/27/2020 - The Truth About Watches
2 years ago

[…] historical echoes are more than skin deep – the 336’s hand-wound Unitas 6498 movement was originally designed for pocket watches. All things being equal – which […]

1 year ago

Any comments on accuracy of the older movement?

Raffaele Prencipe
Raffaele Prencipe
1 year ago

STEINHART Military 42 manual

BERT McAuley
BERT McAuley
7 months ago

CORNEHL, STUTTGART also utilise this movement.

Maurice Lacroix Caliber ML-76 Watch Movement | Caliber Corner
2 months ago

[…] Masterpiece line. This movement is essentially a reworked – or reimagined – ETA/Unitas caliber 6498-1 with a retrograde date and power reserve […]

1 month ago

Great movement, ande very beautiful. I think this is definitely a classic. I have 1 in a Laco Wurzburg. Stays within 10 seconds after a week.

17 days ago

Hi guys, I just bought T119.405.16.037.00and it takes only 13 revolutions to fully wind the watch, after that there is great resistance and I don’t want to ruin the movement. But after the winding, it runs for less than 24 hours. Should I go over the resistance? Or do you havy any recommendation?

10 hours ago
Reply to  Ondrej

I’ve had that ref for about a year, from the gray market. It takes about 30 turns from empty to hit the stop. Mine is still running at -3m per day because I have not had it regulated yet. I guess Tissot just tosses them in the case and sends them to the gray market without thinking about it :(.

Venus Caliber 178
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