... a recently concluded auction in which this "King SEIKO Bell-matic" brought in
$395 -- now, please remember, just because a vintage SEIKO may have been assembled from different watches does not mean it is bad or that the buyer should feel remorse. If you like it and it is worth the price you paid, good for you! But, in the spirit of sharing some knowledge (and please feel free to weigh-in with your own thoughts)...
I don't like the hands. I don't recall ever seeing a 4006-601x with a 27J movement, and I do not think the case is correct for the caseback. So, let us assume the caseback did not come with this watch and the hands are "iffy" -- still an attractive Belle, but for close to $400 I would want something 100% original and darn near NOS.