I was under the impression the CRO27 / Cal 321 were the same movement just renamed at some point in the 1950s. 1940s seems crazy early for a Seamaster though, what year is it exactly? The first Seamaster of any description only came out in '47

 

Yes the 321/320 hands will fit with your movement. If the dial has patina though shiny new hands may look out of place. And of course you have to get the right length and style.

 

Yea cool, love to see it, sometimes you've got no choice when they're past a certain point but I'm sure you bought it well because of that. Are you a professional or amateur watchmaker or a collector?

 

The movement you pictured looks like it is in pretty decent shape - is the dial really that bad? I suppose it could have been soiled from above rather than from below - perhaps you'd like to post pictures of the dial here before refinishing?

 

Yea I know what you mean, finding the odd and uncommon pieces and bringing them back to their former glory is one of the great joys of it, I love finding something that looks like junk, doing a sympathetic restoration and ending up with something beautiful.