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·Well, I am curious. Could you explain why it deviates so much from the Speedmaster 101 price chart?
That dial is very special, it has nothing to compare with regular production dials hence the sp101 table is totally irrelevant to value such a watch. There are certainly less than 20 grey dial speedmasters known worldwide in a condition comparable to this one or better, let alone on a 105.012-63.
IMO they are fully entitled to test the water with their asking, at least worth a try - these watches only appear in auctions and usually score high, unless their condition isn't good enough to attract the big boys.
This is the kind of Speedmaster specialty that will sell for as much as an informed collector, looking exactly for this, will be ready to pay. And any well informed collector will know that if he can't afford this one at that price, he'll have to be (very) patient till another one eventually comes up for sale.
Finally, an informed collector looking for exactly this, will certainly have other interesting pieces he might be willing to trade-in. From my personal experience with DBs, they are always curious to see what they might get from you in a deal, balanced with cash.