ETA Movement Data (BPH, Size, Features, Jewels)

[daytona4me]

I have had to do a lot of goolge searches trying to find out beat rates on movements and which have what features it has..etc..
So I have decided to copy some ETA info here. I may add some genuine brand movement info here as well because some use the eta movement and it is helpful to know when you are wanting to upgrade your movement.

 

[jag0]

Thank you SOOO much for this.. VERY VERY helpful!

 

[Kahn]

i looked for this forever and a day....and here it is! Thank you sooo much!

 

[newwatchmaker]

thanks so much

but I think ETA 2846 has 25 jewels not 21 jewels.

 

[bitmit]

Am I missing something? I don't see any info about movements here!

 

[SidakCo]

Yeah, do I not have access to the information yet? I have this problem with other posts.

 

[ABC123]

Don't see anything!

 

[audace]

Don't see anything!

+1

 

[andries]

Since there is no information in this post. I will share some of my findings. If admins have anything against it - feel free to either edit or delete my post. I am not an expert in watch movements and this information is a compilation of what I read at different sources.

Main characteristics of the watch movement are:
1) Number of jewels (17 in older ETA, 21+ in modern movements). Jewels are made of rubys and serve as bearings - ruby is hard and is not worn out like it would happen to the bare metal. Some people argue that overjeweled movements (Bretiling B01 has 40+ jewels) are not good. I don't see any reasonable explanation for this. Except maybe for the fact that over jeweled watches may seem to be not well engineered - putting jewel where it could be avoided

2) Number of oscillations (BPH) - the greater it is - the more smooth is second hand motion. Another advantage of higher beat watches is supposedly better accuracy - since it oscillates faster it measure time in smaller intervals which leads to more precise measurements. Modern watches have beat rate in the range 18000 bph - 36000bph (in some Seikos. I've never read about watches with higher beat rate) which corresponds to 5 beats per second to 10 beat per second range. Disadvantage of higher beat rate watches is the fact the more oscillations means more friction and these watches need more often service, or at least are more sensitive to the contaminants.

Other characteristics of movements are dimensions - traditionally measured in lignes - 1/10 of the inch, thickness of posts - measured in mm. Angle of the free weight oscilation (measured in degrees) indicates how well movement functions and how free it can move. The latter one is often posted alongside with refurbished or serviced movements. I was not able to find any factory standards for it.

Database of ETA movements - quartz and mechanical can be found here It contains way more than just ETA movements. Search for whatever you want - for example Orient or Seiko movements are there as well. I am just too lazy to retype it here.

Here is another database of genuine swiss movements with information about their origins and settings for watch winder if you use it.

And specifically for the fans of watch porn - pictures of watch movements

Once again, I apologize for hi-jacking this thread. If OP wants to modify my writing or delete it - no offense will be taken.

 

[andries]

Some of movements to save people from browsing:
[SIZE=+1]ETA 2834[/SIZE]

Features
automatic
sweep second
day: curved at 12h, quickset
date: quickset
hack feature

Data
13''', Dm= 29mm
H= 5.2mm (H= 5.3mm with ball bearing)
25 jewels
f = 28800 A/h
power reserve 40h

family/generations:
2801: manual wind
2804: manual wind, date
2806: manual wind, date, 36000A/h
2824: automatic, date
2826-2: automatic, big date
2826: automatic, date, 36000A/h
2832: automatic, day, date, 36000A/h
2834: automatic, day at 12h, date, 13'''
2828, 2836: automatic, day, date
suffix -1, -2, J2: generations, variants
not all versions in all generations

[SIZE=+1]ETA 2892[/SIZE]

Features
automatic
sweep second
date: quickset
hack feature

Data
11.5''', Dm= 25.6mm
H= 3.6mm (3.7mm with ball bearing)
Option: 12.5''', Dm= 28mm
17/21 jewels
f = 28800 A/h
power reserve 42h

due to low profile often used as base for modules with additional functions

[SIZE=+1]ETA 6497-1 (Unitas 6497-1)[/SIZE]

Features
stem wind and set
sub second

Data
16.5''', Dm= 36.6mm
H= 4.5mm
17 jewels
f = 18000 A/h
power reserve 56h

[SIZE=+1]ETA 6498-1 (Unitas 6498-1)[/SIZE]

Features
stem wind and set
sub second

Data
16.5''', Dm= 36.6mm
H= 4.5mm
17 jewels
f = 18000 A/h
power reserve 56h

[SIZE=+1]Valjoux 7750[/SIZE]

Features
automatic chronograph, 60s, 30min, 12h, cam switched
sub second
day: quickset
date: quickset
hack feature

Data
13.25''', Dm= 30mm
H= 7.9mm
17/25 jewels
f = 28800 A/h
power reserve 46h

Family:
7750: automatic, day, date
7751: automatic, day, date, month, moon phase
7753: automatic, date. minute counter at 3h instead 12h
7754: automatic, date, dual time 24h
7758: automatic, date, moon phase
7760: manual wind, day, date
7761: manual wind, day, date, month, moon phase
7765: manual wind, date, no hour counter
7768: manual wind, date, moon phase
7750: automatic, split second, date hand at 3h