Hi @mac_omega

I agree a proper 30T2Rg or 30T2SCRg should have a bimatellic and cut balance. , ( also dont forget the Rg also has a deluxe finished balance staff ) .

What I disagree with is your statement "Later monometallic balances are interchangeable as well but are not correct for the chronometer movement." The manufacture makes the decision on replacement parts and from Omega as you stated later 262-1327 ( balance complete) you might get a "smooth" balance wheel ( non cut monomatellic balance) . The part is correct as it will fit and work in the watch , by the way would keep incredible time. I have seen this myself... And I agreed its original to the model but the manufacture blessed the later replacement parts.. I am not saying it will have the same value as a watch with the bimatellic and cut balance , but saying its not correct replacement part for the watch is what I disagree with Omega says it ok.... so when you have a watch that runs or not. I would rather have a running watch personally .

Let say you do go an source a used balance from a 30T2 / 30T2SC . ( non shock proof). Should you then get it restaffed with a 30T2Rg staff? or just use the entire balance assembly? ....

Eric, Again I prefer a 30T2SCRg / 30T2Rg to have bimatellic and cut.

Good Hunting

Bill

 

HI @Syrte

The real secret is that just about ANY 30 mm Omega movement is capable to achieve chronometre time keeping... IF it was not abused when it left the factory... ( as long as a "shoemaker" did not get into the watch ).

The contract for the MoD specified timing standard for the military watches... When you pull the specs up from Omega they refer to it as 30T2 " RS" for special regulation..... I forget the specs but its basically to chronometre standards.

The 30T2Rg has " deluxe finished parts and the drive train wheels are also specific to the Rg models... its truly stunning to look at under a loupe. But a " good old" 30 mm will keep great time.... as well...

The simplest way to compare the versions is to look Omega material list of the 30T2 and the 30T2Rg ... the Rg list will show what parts are different from the base model. Some parts are just visual ( like the winding wheels) and all the drive train and balance were also made to a higher spec.

I will see if i can find the pages... and post..

here are the pages...

here is the first page from the 260 material list showing all the parts...


and here is the 262 ( 30T2Rg) showing all parts that are different from the base caliber 260 ( 30T2) .


and the part and descriptions that are different from the base caliber.





Good Hunting

Bill

 

Hi @mac_omega

Your saying both way...

from a previous post
quote #1 "the balance wheel must be bimetallic and cut - then it is legitimate for a swap/replacement. Later monometallic balances are interchangeable as well but are not correct for the chronometer movement. A bimetallic balance is a must"

and you posted this in a later reply.

quote #2 ""it may be a correct replacement and it will work properly but it does not look right!""

Please keep in mind your held to a higher standard.... your first quote is your opinion. My point is the manufacture says it will work and keep great time. You can disagree with them but they are the manufacture and you can choose only to collect "bimatellic and cut balance " in your watches.. that fine too....

Quote #2 I totally agree with you..... Heck I told that to Franco many many years ago when we met in the Uk. He showed me his latest chronometre .. I told him " its stunning except for the later monometallic balance".

As I mentioned before... if you were to salvage a balance from a non Rg shockproof watch ... would you have your watchmaker restaff it with a Rg balance staff? I curious how far would you go... is the only a visual thing? There is no right or wrong answer .... it just get into what one collects and to what level?

Good Hunting

Bill
PS I saw a copy of your book yesterday being sold at a auction. 299 plus a 25% premium ! 373.75 ! I think that is great !!! congrats !

 

Hi @M'Bob

Difference is in this case , a running watch vs a non runner.. and I also mention that it could affect the value of the watch as well....

Bill