On first blush this speedmaster looks correct but really its not:
http://www.ebay.com/itm/OMEGA-SPEEDMASTER-2998-2-/271077074967?pt=Wristwatches&hash=item3f1d73e817Purchases made through these links may earn this site a commission from the eBay Partner Network
Wrong bezel (even the replaced one is wrong), wrong pushers (too big) wrong hands (both subdial and the minute had - too short), wrong dial (should have a non-tritium dial). Movement though if it is 17,6xx,xxx as far as I can tell is correct for the 2998-2. Obviously the asking price is way too high for this particular example. Shows you the many pitfalls when buying a cal. 321 speedmaster - the earlier the more dangers there are!

 

Added photos to the original post for completeness. I have to be honest, I saw this on eBay earlier and literally thought, damn, nice looking watch before reading this thread. Was never going to be a buyer at 8.5k but still disturbing to see

 

Its totally fine to mention chrono24, or even to link directly to ads, same for eBay and for other forums, only rules regarding censorship are counterfeit and/or fake watches, zero tolerance on that, anything else is fine.

 

The chrono24 watch has lots of problems too - wrong bezel (that came from a modern reissue speedmaster homage to the 2915) wrong dial - tritium dials were not used until the 105.003 (it was radium up to the 105.002), wrong hands - probably all of them including the lollipop, and wrong bracelet (too late) and possibly wrong box (though not 100% sure on that one). So the chrono24 watch is just as wrong at twice the price!

The 2915-3 up to the 2998-2 had the black base 1000 bezel.

 

This Speedmaster is back at auction:

http://www.ebay.com/itm/OMEGA-SPEEDMASTER-2998-2-/271079606696?pt=Wristwatches&hash=item3f1d9a89a8Purchases made through these links may earn this site a commission from the eBay Partner Network

 

I just threw $1,000 at it for good measure

 

I'll be saddened if the reserve is still $8,500 like before....

Judging by the ad, I get the impression the owner may have bought it from a dealer at dealer prices and be trying to recover as much as possible

 

It looks like the seller is now asking questions about the dial in the purists as the watch continues on its sale on ebay:

http://omega.watchprosite.com/?show=forumpostf&fi=677&pi=5546068&ti=821478&s=0

 

Speaking of Speedmaster with wrong bits:

http://www.ebay.com/itm/Omega-Speed...482779470?pt=Wristwatches&hash=item484a373d4ePurchases made through these links may earn this site a commission from the eBay Partner Network

Straight lug no crown guard case, but with Pro dial and 145.012-67 caseback, lume appears redone, and although the seller CLAIMS its been serviced, the hours subdial hand looks like it was pinched off a Flightmaster and painted white, which doesn't look like something any competent watchmaker would ever consider.

 

I am pretty sure the tritium dials absolutely did not come original from the factory for the 2998. They were first used in the 105.003 and not earlier. The hands that are shorter are also wrong - these came from seamasters that were then fitted to the speedmaster thus looking shorter in the speedmaster. And in your examples of parts overlap, the trend is always that earlier parts are used for later models until they are finished - here what is being proposed is the opposite - newer parts used in older models which does not make sense.

 

That certainly makes more sense than the argument the dealer is putting forward. Ultimately its a premium grade watch or at least carried a premium grade price tag and for that, the dealer should be able to provide more than excuses.