I currently have 2 Speedmasters. One is a ref 3753.50 and the other a 3592.50. I'm interested in getting an older chronograph and have had my eye on the 2 and 3 register Seamasters.

I'm leaning towards the 321, mostly for aesthetic purposes but also because of the movement's use in the older Speedmasters. What are your thoughts on the 320 vs. 321?

Other than the overall history of the Speedmaster, is there a reason why the Seamaster 321 is a fair bit less in price to acquire than the Speedmaster given that the movements are similar or perhaps identical?

 

The Speedmaster and it's history/popularity is the main reason for the gulf in value.

It's also worth pointing out that the 321 Seamasters are smaller than the Speedys, so some people find them slightly too small.

 

Seamaster 321 is the watch of choice for Roger Smith, enough said .

 

I can't say much about the 320 versions but the 321 Seamaster chronos are lovely watches. They might be small measured by today's standards but after a few moments on the wrist I tend to not recognize the smaller size anymore.
Happy hunting!

 

Although the 321 movement is common to both, the smaller dial and hands, plus lack of a bezel, cause the Seamaster to be 6mm narrower in diameter (41mm vs 35mm I believe). In addition, as the Seamaster often has a tachymetre scale on the dial, it's face can appear more cluttered.

And the Seamaster never went to Space.

 

Beautiful looking piece, my humble 320 in comparison.

 

The dial isn't perfect, but I absolutely love the detailed coffin markers on my 2278-3 Cal 320, and the golden hue it exhibits in the sunlight

 

I'm a Connie devotee so the size of course doesn't bother me but I love my pink 320
Because of the problems pointed out by @dsio I wear it only occasionally - makes it all the more special when I do strap it on though

 

Can I ask a noob q... Do the 321's that go on seamasters fit in speedy cases? Are they the exact same size? And are 321 movements worth less if they belonged to a seamaster?

 

I remember yours as it was the only decent example to look at when I thinking about bidding on mine

These beautiful watches seem to be relatively few and far between and don't get anywhere near the exposure they deserve.
So pictures please!

 

If omega didn't have an extract service maybe it wouldn't make a difference then? Just would need to match year to serial and you're good.