Omega

Hi

some details of your calibre are here

www.ranfft.de

Remarks
1949-
as Omega R17.8 from 1939

family:
300 (R17.8 until 1949): sub second
301 (R17.8AM until 1949): sub second, antimagnetic
302: sub second, Incabloc, antimagnetic
310 (R17.8SC until 1949): sweep second
311 (R17.8SC AM until 1949): sweep second, antimagnetic

Features
manual wind
sub second

Data
Dm=17.8 x 22mm
H=3.25mm
17 jewels
f=21600 A/h
power reserve 45h

Your seem to be an early variant because it doesn't have the copper rose gold finish.

best regards

georges

Hi Steve,

This is a R 17.8 SC supposedly from an early run as it still has the nickel finish.

Nickel SC  17.8  movements are not often seen... most are the sub sec versions in rose gold guilt.

kind regards

Erich

 

   

  Can you tell what caliber it is ?  

It is based on the sub-second cal 28, aka cal 360. It should be stamped 28 SC under the balance.

These movements were originally introduced in 1944. The nickel finish and serial 9,9XX,XXX serial would both date this movement to around this year.

While they look quite similar to the much more common 30mm calibres, in fact they share almost no parts in common.

It this movement in a watch that you own ?

grumio

  Yes, it's a 28SC and it's in my collection, Grumio. Here are a few more pics.

 

                          

                          

                         

                          

                          Regards.

 

                         Hoi

Looks very much like some of the 30mm chronometer variants.

The dial looks well aged aged, but it seems to be quite even. The case looks in nice shape.

These 28SC models do turn up from time to time, but they seem to be much much less common than the 30mm family. I wonder why ?

thanks for sharing

grumio

 Hi Grumio.

  I guess the 28 is less common just because it didn`t fit into category D _ 13 lignes (30mm or less) at the competions  _am I right .

  I`d also like to ask about ref 2256, because I bought one today without knowing anything about it, the only thing I know is it`s big size, maybe 39mm..

 

    

  Anybody here involved in that fight

 

   Regards.

 

  Hoi

 

 

 

                         

Hi Hoi,

congrats! I have seen that you was successful!

I have been involved as far as I had put a snipe on it - but much too low...

I would have bought it at a much lower rate for just the movement´s sake as I needed it for parts.

It has a 30 T2 SC Rg in it which was surely not born with this watch case - I think it is a put together piece just using a left over movement.

My guess for the size is 37,5 mm as most of these large cases of this era.

But the movement looks to be in very good condition!

Enjoy it!

Erich

Hi Erich.

 The reason I bought it because of the size of the case and a rare ref (?) , the movement is not very important to me (there is another one out there and I won't compete too hard on that ;(  )

  By comparing to my 2544 and 2545 (39mm cases), it looks like this one is a 39mm case. Let's look at these pics.

             Ref 2545.

     

  Anh the one I bought

   

 The movement itself is 30mm then I add up the thickness of the rim around (about 4,5mm or 5mm each side), it must be 39mm. Don't you think ?

 

  Regards.

 

  Hoi

Hi Hoi,

You may be right... it really looks like a 39mm case.

But do you really think that it is an original case / movement combo??

I suspect it is a put together watch... but I stand to be corrected...

regards

Erich

Hi Erich.

  The reason I bought it just because of the case, It's a very early case, it looks big and original. I am not sure if it host that Rg from that day or not but I am sure  I will have a huge combo on my wrist and happy as a clam.

  In the same time, I also bought another huge 283 in a gold case from France, I will post them here when I have them and please give comments.

 

   Regards.

 

   Hoi

 

    

 

 

                                                                                              Do you buy Rolex, sometime ????

 

 

                                                                                                                                                    

 

     

 

 

                                                                                                                                        This one just come today.

This message has been edited by hoipolloi on 2011-05-27 20:05:24

Hi Hoi,

I am not a typical collector of sports Rolexes as most collectors are...

There are some "Princes" in my humble collection only because I like these iconic art deco designs - 

and I like the rectangular cases with the duo dials a lot!

But it seems that they are a bit out of fashion at the time?

kind regards

Erich