Omega Bumper is fragile???

Jan 31, 2012,06:00 AM
 

Hi Erich,


I just had to let you know of my experience with Omega Bumper movement number 10622794.

This watch was bought by my grandfather in 1946. He went on a road trip to Switzerland from the North of England then. He wore that watch every day of the rest of his life until he died in 1966. After that my father wore it every day of his life until 2009. To the best of my knowledge, it has had no more than three services since 1966. The watch stopped in 2009 and Dad bought a quartz watch. 

I inherited that watch in January 2011. It was stopped and not knowing any better and being of a curious disposition, I opened the back and found the balance somewhat sticky. I thought the mainspring was broken since even when I wound and wound it, it never came to a stop. I did not then realise that these autos and I now believe all autos allow slippage so as not to over strain the winding mechanism. 

This is where the job got nasty. I looked at the watch, a mere curio that had worked for a solid 63 years with little or no attention since 1966 and decided it was probably not worth doing much with. Thus, I took some switch cleaner and lubricant (servisol 10) a kind of volatile swizzing solution, and squirted it into the movement. It bubbled about and the movement started working, though a bit fast since the hairspring was sticking to itself when wet.

I decided to give it a crude clean and placed the movement in a shallow bath of naptha (Ronsonol lighter fluid here in the UK). I swished the movement about and some black rubbish floated out - dust really. I emptied the very shallow (3mm) bath and gave the watch another two swishes until the fluid remained clean. It ran the whole time and when it dried out, the watch performed to a daily rate of -12 seconds.

Taking pity on the ancient staffs and pivots and jewels, I very carefully introduced some very light silicone lubricant to all accessible jewels with a blunted hypodermic needle and gave tine puffs of servisol to those I could not get at. Servisol contains about 3% light oil, so when  it evaporates away it leaves a tiny amount of lube. I was VERY careful not to get any of this on the hairspring, because I didn't want it to stick to itself and upset the timing.

I had to regulate the watch a little, and it has been running to a daily rate of one to two seconds a day for a month.

I know the actions I carried out will be regarded as mortal sins among horologists and watch buffs, but rest assured I will have it serviced properly now I know how good a watch it is. As to the idea that the 28.10 would shake itself to bits if worn - not in this case. My father and his father wore it 24/7 for 63 years and it saw little care and attention in that time. It is a GREAT watch in my opinion, and I am very glad that I've got it.

Kind regards

Tony

smile








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Omega 28.10 Bumper - Chronometre dial qualification ?

 
 By: mustbeinsane : November 20th, 2010-06:52
Hello All, Can any one help me with a question regarding the 28.10 Caliber Bumper (automatic).Having done some research - I am led to believe that only approx. 2000 of these were produced,featuring the exposed springs to cushion the movement of the rotor.... 

IMO there are most...

 
 By: mac_omega : November 20th, 2010-07:53
Hello, IMO there are most of the cal 28.10 bumpers with simply the words "Omega" and "Automatic" below. Referring to the Centenary chronometers: only the small version with ref 2499 ( I hope I recall correctly) has a 28.10 movement - BUT has the addition ... 

According to info ..

 
 By: DeGeus : November 20th, 2010-11:08
.. from Richon's book 'Saga' the 28.10 (later renamed cal.340) came out in 1943 (together with the 30.10 / cal.330 - both with exposed buffer springs), while in 1947 the "Jub" version of both calibers was introduced (still with exposed springs). This was ... 

Further Clarification.

 
 By: mustbeinsane : November 20th, 2010-15:11
Okay,thanks guys - It would be very difficult if not impossible to gauge how many were purely Cal 28.10 (340).Is this a robust movement and well regarded for accuracy,nor withstanding its non-chronometre status ? Is there any interest,particularly in the ... 

I would not rate...

 
 By: mac_omega : November 21st, 2010-02:30
I would not rate a watch with Cal 28.10 as a daily wearer, just a piece to rest in the collection. The reason: These first bumper movements were not very reliable due to the fact that there was great force to the oscillating weight. The impact was so heav... 

It's always a good idea

 
 By: hoipolloi : November 21st, 2010-07:04
to have one 28.10 in your collection. Here's mine....  

I am slightly more reassured !

 
 By: mustbeinsane : November 21st, 2010-15:36
Thanks for the posting and the pictures - I rather feel like a lone voice - Can I ask how you get one with yours / - did you have any problems with the springs,or movement of the bridges or other parts ? - what sort of winding/hours running do you get - a... 

Here are some pictures.

 
 By: mustbeinsane : November 22nd, 2010-13:40
I have purchased this from a NAWCC registered retailer of vintage watches,for what its worth.The movement looks very clean and tidy - as do the screws and bridges.The serial number is pretty spot on for this caliber 28.10 RA PC of this time,as does the ca...  

That dial may be for later models.

 
 By: hoipolloi : November 22nd, 2010-18:17
By looking at the logo, I guess it was for newer models. The logo for that era should be printed in ink or had round edges like this one....  

It appears to be so !

 
 By: mustbeinsane : November 24th, 2010-12:33
Hello, I am in receipt of the watch and despite the Omega Automatic legend/script looking raised on the pictures posted - under a x 10 loupe - it is clearly printed and as flat as a stamps - its not a bit raised,even when you turn it through 180 degrees -... 

Here's the close up shot of my 28.10

 
 By: hoipolloi : November 24th, 2010-15:49
28.10 18k version. And I am always skeptical when I see old clean black dials from those old days. That black dial looks to good to be original to me....  

Omega Bumper is fragile???

 
 By: volpoon : January 31st, 2012-06:00
Hi Erich, I just had to let you know of my experience with Omega Bumper movement number 10622794. This watch was bought by my grandfather in 1946. He went on a road trip to Switzerland from the North of England then. He wore that watch every day of the re...