p_savage6
35
Dennison case on 1958 Omega Seamaster
Hi all
just bought a vintage Omega Seasmaster automatic Cal 501, from 1958 (16 million serial number and hallmarked inside the AL Dennison 18K gold case with Birmingham, J mark).
But I'm stumped........
The case number inside the watch bears no resemblance to those on the Omega Vintage resource internet site - this one reads 897914
Is there any way these numbers relate to the Omega case back numbers or is there a table of Dennison numbers which refers to the Omega case numbers somewhere please?
Grateful for any help here, or any ideas about which Omega case this actually is
http://s1121.photobucket.com/albums/l508/sherbie1231/Omega%20Seamaster%20Cal%20501/
The movement is absolutely pristine - I can only see 2 sevice marks in 53 years - and its only losing 2s per day currently
cheers, Paul

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thanks Graham
By: p_savage6 : March 2nd, 2011-12:49
funny enough, I was just reading your post. Dennison definately did "named" Omega watches - I know that ALD cased Constellations appear from time to time, and another 18K ALD Seamaster completed on ebay just yesterday cgi.ebay.co.uk as you can see, I need...
Hi Paul..........
By: aroma : March 3rd, 2011-03:08
I have had several Dennison cased Omegas - I had a 1963 Seamaster which had a smooth back - I believe some were left smooth as these were often 'presentation' watches and the space was left for the inscription. I have seen identical Dennison Seamasters wi...
Andrew, i've just checked...
By: G99 : March 3rd, 2011-03:18
Andrew, i've just checked my dennison cased Omega and all have the same theme with ref numbers. if you take the 5 out of the ref number you get an omega ref number ie 168(5).004 so my theory is that Dennison added a 5 to differentiate between their cases ...
Actually I have...
By: mac_omega : March 3rd, 2011-07:19
Hi Andrew, actually I have an English case too, not Omega but a Zenith without Dennison markings. It has "ZWC" as a marking instead of "OWC" - so it could mean either "Zenith Watch Case" or "Zenith Watch Company". And with Omega you can play the same: "Om...
thanks guys
By: p_savage6 : March 3rd, 2011-12:36
for your help The "5" theory obviously doesnt work all the time - as my case is marked "897914" The closest match I can see on the Omega vintage website are OT 2909 or CK 2869 (but this has 19 mm lugs) - but cant see any link between these cases and the n...
hi Paul, the reason...
By: G99 : March 3rd, 2011-12:44
hi Paul, the reason that the '5' theory doesnt work on yours is that it was made before they bought in the 168.004 style of reference. it seems to work perfectly on all watches that use that reference which was from around 1960 onwards. what they did befo...
Whooops...
By: p_savage6 : March 3rd, 2011-13:21
apologies - never meant to offend (but the sale had closed, if this makes any difference) - but wont do this again Never thought taking a wrist shot would be so hard and take so long - 15 mins and this is the best I can do (apols again !) cheers, paul...
nice watch Paul and not...
By: G99 : March 3rd, 2011-13:32
nice watch Paul and not a bad wristshot on first attempt. you really should join in the friday wristscans in the wristscan section. its a fun post where people can show what they are wearing on last day of the week or the weekend. i do like the dial on th...
My Seamaster
By: aroma : March 4th, 2011-03:26
Hi again Paul, I've dug out some photos of my Seamaster - I sold it on last year to finance the 18kt Connie so there's no regrets really (well there is but you can't keep them all). As I said before, my Seamaster was a 9kt Dennison cased example hallmarke...
very interesting
By: p_savage6 : March 4th, 2011-12:49
Graham, Andrew I'm fairly new to watches, but had been lurking around here for a few months before I joined up and started posting. A novel approach, just to collect birth date watches, but a nice one. I'm a '62 myself - but have only the 7 watches now - ...
Another example
By: aroma : March 10th, 2011-08:17
Just been browsing and found this Firstly an English cased (Dennison I think though marked OWC and London hallmarked 1968). Case ref is 1665020 and now the Omega equivalent 1660020 But the '5' theory doesn't always hold - I wish I knew why Cheers...