So for the sake of official numbers:
- 550 Flasks were available as part of the bottle set (400 of which were available in NA)
- 100 Flasks sold separately

So the big question is what the different versions of the Flask are?
-I think the one with grey hex bolts came in the bottle set
-The one with silver bolts were given to tastemakers.
-I assume the 100 Flasks sold separately had silver bolts as well but I don't know for sure (anyone can confirm?)
-The one with red bolts were variants done internally and for testing (as well as given away?)

Ok, I got some clarification from one of the key designers:

Raw silver = 100 for sale as flask only. Extra 50 to key influencers, celebs, giveaways.

Gunmetal (grey) = the flasks that came with the bottle (400 worldwide - some reported 400 in NA by itself and another 150 for the rest of the world; however, the bottles say 400.)

Red = prototype color, I think there were only a couple.

Various one-offs for Michael Jordan, Ryan Reynolds, a Cerekote OD Green “Molon Labe”, etc. with various coloured bolts. These various one-offs may be part of the 50 given to key influencers, celebs, giveaways, but I have never confirmed it.

So a little over 550-ish in total.