That is weird! If you wanted to calculate the probability of that happening, you would need to know how many were made each day, some details about their distribution, the probability of you and the previous owner of the two SX-64s buying those machines, the probability of the previous owner selling it, the probability of you finding the auction, the probability of somebody who might have outbid you *not* finding it.......
There are just too many variables. Suffice to say it is very unlikely :-)
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moto