Very good question but hard to judge IMHO.
There was one at Sotheby´s in the UK on auction on 17.04.2018 (lot 23). It had an estimate of GBP 2.000 - 3.000 (lol).
It sold für GBP 18.750. I also remember one from Australia offered ca. two years ago. it was a very original one with a strong tropical look. They asked for USD 25.000. I don´t know whether it was sold. Rene Kesting (vintage-breitling.com) also offered one on behalf of a friend on IG some time ago. I contacted him and he asked for EUR 25.000 for it. It was a very nice looking piece but might have been polished a bit. I also don´t know whether this one was sold or at what price.
In conclusion IMHO there should be a range from USD 15-30 k for an original early 809 all black depending on the condition. Now it is pure speculation to judge whether the premium of Glenn´s 809 was only caused from the provenence of that particular watch or whether the early 809 are increasing in value in general.
I think the early all black 809 are very diserable and collectable watches because of their rarity and historical imortance. So they might be undervalued in the past because there is a lack of availability. The future will tell ...
Best
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