The production figures for each 2998 reference is less than 1000 pieces. The lower numbers: -1,-2,-3 are only in the hundreds and the -4 around 900. The attrition rate is more contentious but let's say, conservatively, than only half survived then we're certainly talking about less than 3000 watches in total. Worldwide.
After that, consider that these are up to 60 years old and think of the amount of replacement parts and the overall condition of the watch. They're too valuable for them not to be brought back up to running condition and the 321 movement is hardy enough to survive
Next, consider your source. I know of three 2998s that have been through Simon's hands this last month - one of them from me. You only have to look at this Forum when it comes to 321 Speedmasters: the standard advice is go to Simon or STS. How many 2998s do you think your average watchmaker (is there an average watchmaker in this day and age?) even sees, let alone services? You're comparing numbers of all 2998 production to the "Holy Grail" 376.0822 which was in limited production in 1986? Or to the moonphase Speedmasters - all of them or just one reference? (I quite like the 304.33.44.how.long.can.a.ref.be but most others are a little meh). Compare all the 2998s against all the Moonphase references passing through the hands of all watchmakers and you'll get a full picture. Any other way and you're like the blind guys with an elephant.
Finally, not when it comes to rarity but to value, you have to consider desirability. The venerated Maddox might have wanted a 5100 driven Speedy but not everyone does. Are the moonphases, well I've said I do like one of them but, on the whole are "really" Speedmasters. They're not that classic, hard, tactile, toolwatch.
The value of a 2998 lies in all of the above and it's pointless to try to isolate any one of those points and argue against the desirability of the piece.
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