Depends on how you look at it. I tend to appreciate Desmond's take on this:
"The Omega calibre 751 is a sibling of the earlier mid-500 series calibres, regarded as some of the best production movements ever produced." And "While one can only speculate why the five calibre 751 Constellations haven’t enjoyed the popularity of their calibre 551, 561 and 564 siblings, it begets a real opportunity for collectors to acquire one of the last of the great in-house movements produced by Omega."
(for whole article:
http://omega-constellation-collectors.blogspot.co.ke/2010/06/omega-constellation-calibre-751.html)
It is btw not a purely coincidence that my 168.029 with cal 751 will arrive this Thursday, so I might be just a bit biased...
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