my first Gruen

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mimmolo
Posts: 5
Joined: Mon Sep 17, 2018 1:29 pm

my first Gruen

#1 Post by mimmolo » Mon Sep 17, 2018 1:41 pm

I just acquired my first Gruen and as soon as it arrives it will go to the watchmaker as rotor seems unable to wind up.

I am very happy with the watch and would like to know if anyone has any information about this model shown in the attached pictures.

Thank you,
Dom
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Barney Green
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Location: Germany

Re: my first Gruen

#2 Post by Barney Green » Mon Sep 17, 2018 11:57 pm

Hi Dom,

welcome to this forum. Most often Gruens do not stay alone for long :-)
The Gruen Geneve brand was the brand of the independent European sales organisation. Gruen US (and Canada) eventually imported watches from them (most famous the Super-G / Airflight) starting in the mid 50s until the early 70s.
These Power-Date marked watches were at least sold between 1963 and 1967, although I do not have exact dates. The movements I have observed being used in them were the Gruen 560RSS (23 jewel) and the ETA2551 (21 and 25 jewel).
From the style of the hands and markers I would date it towards the later period in the second half of the 60s, but I might be wrong with my guessing. My best guess: 1967.

Barney

mimmolo
Posts: 5
Joined: Mon Sep 17, 2018 1:29 pm

Re: my first Gruen

#3 Post by mimmolo » Tue Sep 18, 2018 2:15 pm

Thank you Barney, it's nice to know a little history of the watches I am drawn to collect.
This one is definitely a keeper for me.

mimmolo
Posts: 5
Joined: Mon Sep 17, 2018 1:29 pm

Re: my first Gruen

#4 Post by mimmolo » Wed Sep 19, 2018 6:10 pm

well just received the watch and surprise the auto-winding mechanism is missing from the watch

It's a caliber eta 2472 and is working only by winding for now, it feels even lighter knowing its missing some parts.

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Barney Green
Posts: 253
Joined: Mon Nov 23, 2015 2:30 pm
Location: Germany

Re: my first Gruen

#5 Post by Barney Green » Wed Sep 19, 2018 10:40 pm

Does the movement have the GXC import tax stamping for Gruen? Otherwise it is either 1968 or later or was not intended to be imported into the US.
The ETA2472 was produced from 1962 to 1971 as far as I know, so my dating should be about right. You should be able to get a movement for parts at eby relatively easy around $20...

mimmolo
Posts: 5
Joined: Mon Sep 17, 2018 1:29 pm

Re: my first Gruen

#6 Post by mimmolo » Thu Sep 20, 2018 8:56 pm

keeping an eye on bay, this model is 25 jewels. Does the winding mechanism also have to be 25 jewels?

Also, I've been winding it up manually and it doesn't seem to reach the full wound position like other watches; curious?

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Barney Green
Posts: 253
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Location: Germany

Re: my first Gruen

#7 Post by Barney Green » Thu Sep 20, 2018 10:10 pm

The ETA2472 should run 42 hours on a fully wound mainspring. Either your movement needs a good cleaning or someone replaced the mainspring with a wrong model or shortened a broken one.
I am not familiar with that movement, so I do not know where the extra jewels are sitting, they may ver likely be in the rotor part. But if you buy a 21 jewel version or probably even the 17 jewel version the autowinding part should still fit, but you would not have a 25 jewel watch any more...

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JackW
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Location: Denver-metro area

Re: my first Gruen

#8 Post by JackW » Fri Sep 21, 2018 5:56 am

mimmolo wrote:
Thu Sep 20, 2018 8:56 pm
keeping an eye on bay, this model is 25 jewels. Does the winding mechanism also have to be 25 jewels?

Also, I've been winding it up manually and it doesn't seem to reach the full wound position like other watches; curious?
This is because these are designed to start slipping at a certain point in the wind. They even require a specific barrel lubricant to facilitate this. This is mostly because the autowinding feature never shuts off and fully wound doesn't have a hard stop.

Hand winding autos can have a deleterious effect on the winding parts of the movement. It is something that should be used to get a watch going after it hasn't been worn for a while and the mainspring has fully letdown. Wind a little, and wear it to get the full wind. Brush your teeth with that hand if you are in a hurry. That's what I do. :mrgreen:

You should be able to take the parts from another 2472 and swap things around as needed. Here is some info on that, if you've not seen it already...
https://www.watchrepairtalk.com/topic/4 ... lkthrough/
All I know is based on hard work & writing by others. I can only aspire to augment this body of knowledge. If I am wrong it is because of my own failings. -me
"If I have seen farther it is by standing on the shoulders of giants." - Newton

mimmolo
Posts: 5
Joined: Mon Sep 17, 2018 1:29 pm

Re: my first Gruen

#9 Post by mimmolo » Fri Sep 21, 2018 6:59 pm

Thank you, that explains why hand winding does not reach full stop.
I have my eyes on the bay for some donor movements reasonably priced and good conditions, seems easy enough to accomplish!

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