It's not clear whether you've had it from new or not, but when I got my Apollo 8, one of the chrono hands wasn't homing properly. Took it in to the OB, and the in house watchmaker fixed it. Got to look at the watch under a loupe - all fine. Later that day, noticed dust visible to the naked eye on the dial that presumably got in during the adjustment and moved. So it had to go back and have that removed. So (a) maybe it's just dust that was always there whilst you've had it and has moved (hence my question about whether you've had the watch from new, as if not, it might well have been opened up for some reason) and (b) this was my first experience about making a fuss about something like this, and it was treated like a matter of the utmost, utmost seriousness by the OB.
On the first photo, it looks like you have another mark near the 56 second marker, not visible on the second photo, but it looks like on the crystal?
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