Looks good to me too. That's one of the 10 or so correct references for the caliber 560 Seamaster DeVilles IIRC. Not a bad price.
Nice find you have there Shell695 On my rare cal. 560 hunt, this article (from Omega Constellation Collector's website by Desmond) was the essential source of information for me: http://omega-constellation-collectors.blogspot.com/2009/07/unearthed-more-omega-calibre-560.html .... and other respectable members here were also critical for my decision making when it came to info on this rarity! I believe they may also chime in.
Uncommon, yes, rare, NO and from a technical standpoint not special. Not bad for the price but not really anything special as far as Seamasters go There was a thread here a sometime ago debating just how many of the cal 560 were actually made, maybe someone else can point it out, Dennis?