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mac_omega
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These are the references...

It is quite simple with the chronometer references:

1) Firstly press in back:

2364     small (33 mm) with sub second  (cal. 30 T2 Rg)

2366     large (35,5 mm) with sub second  (cal. 30 T2 Rg)

2365    small (33 mm) with center sweep second  (cal. 30 T2 Rg SC)

2367    large (35,5 mm) with center sweep second  (cal. 30 T2 Rg SC)

These are always cases with the same style, small or large!  Slight difference
in the height of the case backs due to SC (higher) or sub sec. (flat).
All of them with press in case backs.

2) Secondly there is a small number of screw in case references, all SS and sometimes
    SS plus red gold bezel (only) - see the one example which was posted by Bill (Sohne)
    in this thread (rarely seen) - it is the watch on the right side in his picture!
    It is the same ref. as posted by Catherine - which is SS only.

Ther are the following SCREW back references:

2410:  large 35 mm with center sweep second  (cal. 30 T2 Rg SC)  only!
            SS (CK 2410) or SS plus gold bezel  (CO 2410) 

2254: large 35 mm with center sweep second  (cal. 30 T2 Rg SC)    stepped bezel and lugs.

           this ref. is an early version which was usually delivered with a plain 30 T2 SC. As a chronometer
           it was initially equipped with a 30 T2 SC  without special RG device but with a chronometer adjusted movement
           (has specially polished winding wheels and an angled (beveled) and polished "ancre" though!
           Later it was delivered with Cal. 30 T2 Rg SC !
           In one of my earlier postings there you will find a picture of this watch ref. !
Please see:  "30 T2 CHRONOMETER - Please let me know your thoughts!"  (226) posted at: Omega Apr 13th, 2008,00:39

ref: 2244: 

large 35 mm with center sweep second  (cal. 30 T2 Rg SC)    stepped bezel and lugs.

           this ref. is also an early version which was usually delivered with a plain 30 T2 SC but sometimes 
           with a chronometer adjusted movement (has specially polished winding wheels and an angled
           (beveled) and polished "ancre" though. See above (ref.2254 very similar). Later it was delivered with Cal. 30 T2 Rg SC ! 

The case looks the same as ref. 2254 BUT the case back is not a screw back but a press in back!
Otherwise it looks the same - with the beautifully stepped lugs and case.

As Darren´s case is neither a ref. 2410 nor a ref 2254 it is NO chronometer case!

BTW: you can look up most of the given information on the omega website if you do not believe me!

PS: for all the knowing specialists on 30 T2 RGs:
there are some more (very rare) PRESS IN BACK chronometer references (only gold versions) which show up very rarely.
Some of them were made exclusively for the French market and one for the Spanish market.
But this is a different story and may be posted sometimes later when I have got some more details and back ground history!
But this does not match this special posting about SS crew back versions...

Enjoy the information!

mac_omega