This thread has a golden Seamaster Day-Date on bracelet, so such a thing does exist, but its the chronometer rated version. I honestly don't know these pieces, but a few of the vintage experts on here do, all I know is if a jeweller doesn't want to open the caseback to tell you whether its solid gold or not, I wouldn't be buying from him.

 

There's also gold filled... which I believe can be gold all around including caseback. You need to see the hallmark inside the caseback, its really not negotiable, especially when he's selling at solid gold price.

 

I'm in agreement that a jeweler who doesn't open up the case to take pictures of the inside of the watch either doesn't know his market, or is hiding something. I looked at a blow up of the back of the watch and saw this:



I think the caseback is correct for this watch after looking at a few other examples online. In the lower left and upper right there are small Swiss hallmarks. My opinion is that it is solid gold. The only question is 14K or 18K. Also, it looks a little rough around the inside of the lugs. This is generally an indication that the watch spent years on a gold bracelet, which was probably only recently scrapped. A shame, but that is the way of the world right now.

The case doesn't look like it was polished too harshly as the antiquing is still present on the logo. That's the dark highlighting in the middle, which was there when the watch was new.

In a gold capped watch, the back would be mostly steel with just a little bit of gold wrapped around the lugs. Omega did not make this model in gold plate or filled.

In looking at the face of the watch, I do have questions about the hands. Here is a picture of the subject watch:



Here is a picture of a similar watch...had look awhile to find one without tritium on the hands:



The hands on the second watch are a bit more pointed. You can see this watch and more on the Constellation Collectors Blog here:

http://omega-constellation-collectors.blogspot.com/2007/07/omega-seamaster-golden-chronometres.html

Couple the factors above with a price that seems a bit high for this watch, and I'd take a pass.

Hope this helps,
gatorcpa

 

The seller probably has a point about the process of elimination on the caliber. I think he will find that the case is solid 18K gold.

Just to give you an idea of pricing, you can into a very nice pie-pan 14K or 18K Constellation for $2,000 to $2,500. I think the 75X movement models are downgraded slightly in the collecting market as the day/date combo kind of clutters up the dial. At least, that's my opinion.

Remember that you are going to need the proper Omega hands, which might run you another $50 to $100 if you can find them. There is no indication on the website that the watch is serviced or has any sort of a warranty. So factor in another $100 to $200 for a service.

Here's how I would evaluate this watch, if it were my money --

Assuming it's 18K, there probably a little less than an ounce of metal there without the movement, crystal and crown. With gold at $1,800, that's maybe $1,300 melt value. Add another $200 for the dial and maybe another $200 or so for the movement. That's $1,700. Subtract the negatives as noted, you're around $1,400 to $1,550. If this really is a 14K case, then the gold melt value is $300 lower than that.

Anything you pay in excess of the above is IMHO is for collectibility only. Remember that these non-chronometer versions were fairly standard at the time. While they are very nice watches, there's nothing there that makes this an "iconic"Omega that would enhance this watch significantly above its intrinsic value.

Hope this helps,
gatorcpa

 

This thread

This thread has a few of them: http://omegaforums.net/threads/what-are-the-ultimate-Ωmega-collectors-watches.143/

Speedmaster Professional
Constellation Pie-Pan
PloProf
Seamaster 300
FlightMaster
Big Blue Seamaster
Darth/Anakin