Omega

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 resemblanc... 

Omega have case ref's as you obviously know, but Dennison just have case numbers and i dont know of any list showing when they were made, apart from the all important assay mark which shows catagorically when the case was made. its a nice looking watch, t... 

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... 

Paul, if your in the UK i have an excellent watchmaker who used to work for Omega and will be able to source the correct crown. send me a pm if you want to contact him. best graham

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 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 ... 

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... 

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 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... 

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 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...  

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...  

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 - ... 

much appreciated Paul. i'd get that connie serviced if i were you before it starts to wear its parts. G

Thanks Graham its next on the list - as I may have mentioned before, I'm trying out a local (old fashioned) watchmaker for the first time - and if they do a good job, I'll send others his way cheers, paul

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...